Less serious than the struggle with Henry the Lion was Frederick’s struggle with Philip of Heinsberg, archbishop of Cologne (d. 1191), on whom he had just conferred a great part of Saxony. When the emperor went to Italy in 1184 he left the Frederick and Philip of Heinsberg. government of Germany to his son Henry, afterwards the emperor Henry VI., who had been crowned German king in 1169. On all sides, but especially in the north-west, Henry was faced with incipient revolution, and while he was combating this the quarrel between Frederick and the Papacy broke out again in Italy. At this juncture Philip of Cologne united the German and the Italian oppositions. Several princes rallied to his standard and foreign powers promised aid, but although very formidable in appearance the combination had no vestige of popular support. The greater part of the German clergy again proved their loyalty to Frederick, who hurried to Germany only to see the opposition vanish before him. In March 1188 Philip of Cologne submitted at Mainz.
Germany was now at peace. With the accession of Gregory VIII. pope and emperor were reconciled, and by the marriage of his son Henry with Constance, daughter of Roger I., king of Sicily, the emperor had reason to hope that the Frederick’s death. Empire would soon include Naples and Sicily. Resolving that the sunset of his life should be even more splendid than its dawn he decided to go on crusade, and in 1189 he started with a great army for the Holy Land. When the news reached Germany that he had been drowned, an event which took place in Cilicia in June 1190, men felt that evil days were coming upon the country, for the elements of discord would no longer be controlled by the strong hand of the great emperor.
Evil days did not, however, come in the time of Henry VI., who, although without his father’s greatness, had some of his determination and energy, and was at least his equal in ambition. Having in 1190 reduced Henry the Lion Henry VI. once more to submission, the new king set out to take possession of his Sicilian kingdom, being on the way crowned emperor at Rome. At the end of 1191 he returned to Germany, where he was soon faced by two serious risings. The first of these centred round the restless and unruly Welfs; after a time these insurgents were joined by their former enemies, the rulers of Saxony, of Thuringia and of Meissen, who were angered by Henry’s conduct. The Welfs also gained the assistance of Canute VI., king of Denmark. Equally dangerous was a rebellion in the Lower Rhineland, where the emperor made many foes by appointing, regardless of their fitness, his own candidates to vacant bishoprics. At Liége this led to serious complications; and when Bishop Albert, who had been chosen against Henry’s wish, was murdered at Reims in November 1192, the emperor was openly accused of having instigated the crime. At once the rulers of Brabant, of Limburg and of Flanders, with the archbishops of Cologne and Trier, were in arms. In the east of Germany Ottakar I. of Bohemia joined the circle of Henry’s enemies, and the southern duchies, Bavaria, Swabia and Austria, were too much occupied with internal quarrels to send help to the harassed emperor. But formidable as were these risings they were crushed, although not entirely by force of arms. In 1193 Richard I. of England passed as a prisoner into Henry’s keeping, and with rare skill the emperor used him as a means of compelling his enemies to come to terms. Henry the Lion was the last to submit. He made his peace in 1194, when his son Henry was promised the succession to the Rhenish Palatinate. Returning from another visit to Sicily, the emperor was now so powerful that, in pursuance of his plan for making himself the head of a great world monarchy, he put forward the suggestion that the imperial crown should be declared hereditary in his family. This proposal aroused much opposition, but Henry persisted with it; he promised important concessions to the princes, many of whom were induced to consent, and but for his sudden death, which occurred in Sicily in September 1197, it is probable that he would have attained his end.
Great as was Henry’s authority many of the princes, chief among them being Adolph, archbishop of Cologne (d. 1220), refused to recognize his son, Frederick, who had been chosen king of the Romans in 1196. This attitude Philip of Swabia and Otto of Brunswick. was possibly owing to the fact that Frederick was young and inexperienced; it was, however, more probably due to a revival of the fear that the German princes would be entangled in Italian politics. For a time Adolph and his friends, who were mainly princes of the Rhineland, sought in vain for a new king. While they were thus employed the friends of the house of Hohenstaufen, convinced that Frederick’s kingship was not possible, chose the late emperor’s brother, Philip, duke of Swabia, to fill the vacant throne; soon afterwards the enemies of the house found a candidate in the person of Henry the Lion’s son, Otto of Brunswick, who was also chosen German king. Thus the struggle between Welf and Hohenstaufen was renewed and civil war broke out at once. Philip’s supporters were the nobles of southern and eastern Germany, while a few cities in the west owned his authority; Otto’s friends were found mainly in the north and the north-west of the country. The number of available warriors was increased by the return of many crusaders, among them being the famous soldier, Henry von Kalden, who was mainly responsible for the success of Philip’s cause in 1199. If Germany had been unconnected with the Papacy, or even if the Papacy had been as weak as in the days of Henry VI., the issue of the strife would almost certainly have been an early victory for Philip. A majority of the princes were on his side and the French king Philip Augustus was his ally, while his personal character commanded general respect. Otto, whose chief supporter outside Germany was his uncle Richard I. of England, on the other hand was a harsh and violent man. But unfortunately for Germany the papal chair at this time was occupied by Innocent III., a pope who emulated Hildebrand in ambition and in statesmanship. At first vacillating, but by no means indifferent, Innocent was spurred to action when a number of princes met at Spires in May 1200, declared Philip to be the lawful king, and denied the right of the pope to interfere. He was also annoyed by Philip’s attitude with regard to a vacancy in the archbishopric of Cologne, and in March 1201 he declared definitely for Otto. The efforts of the pope helped to rekindle the expiring flames of war, and for a year or two success completely deserted Philip. He lost the support of Ottakar of Bohemia and of Hermann I., landgrave of Thuringia; he was driven from North Germany into Swabia and Otto’s triumph seemed assured. From 1204 onwards, however, fortune again veered round, and Philip’s prospects began to improve. Deserted by Ottakar and even by Adolph of Cologne and his own brother Henry, count palatine of the Rhine, Otto was forced to take refuge in Brunswick, his last line of defence, and was only saved by Philip’s murder, which occurred at Bamberg in June 1208. A feature of this struggle was the reckless way in which the rival kings gave away the property of the crown in order to gain adherents, thus enriching the princes and weakening the central government.
Otto was now again chosen German king, and to aid and mark the general reconciliation he was betrothed to the murdered king’s daughter Beatrix. Nearly all the princes acknowledged him, and as pope and king were at Otto IV. becomes sole king. peace, Germany enjoyed a period of comparative quiet. This however, did not last long. Having secured his coronation at Rome in October 1209, Otto repudiated the many pledges he had made to Innocent and began to act in defiance of the papal wishes. To punish him the pope put forward his own ward, Henry VI.’s son Frederick, who was living in Sicily, as a rival king. While Otto was warring in Italy a number of influential princes met at Nuremberg, at the instigation of Innocent and of his ally Philip Augustus of France, and invited Frederick to come to Germany. Otto then left Italy hurriedly, but he was quickly followed by his young rival, who in the warfare which had already broken out proved himself a formidable opponent. Seeking to mend his failing fortunes, the Welf went to France to support his ally, the English king John, against Philip Augustus, and at the battle of Bouvines (July 27, 1214) memorable in the history alike of Germany, of England and of France, his fate was sealed, although until his death in May 1218 he maintained a desultory warfare against Frederick.
Frederick II. was, if not the strongest, certainly the most brilliant of German kings. With the medieval passion for adventure he combined the intellectual culture and freedom of a modern gentleman. A lover of poetry, of art and of science, Frederick II. he was also a great statesman; he knew how to adapt his policy to changing circumstances and how to move men by appealing at one time to their selfishness and weakness and at another time to the nobler qualities of human nature. For outward splendour his position was never surpassed, and before he died he possessed six crowns, those of the Empire, Germany, Sicily, Lombardy, Burgundy and Jerusalem. But Germany profited neither by his gifts nor by his prestige. After Bouvines he purchased the assistance of Valdemar II., king of Denmark, by ceding to him a large stretch of land along the Baltic coast; and, promising to go on crusade, he secured his coronation at Aix-la-Chapelle in July 1215. Then being generally recognized as king he was able to do something to quell disturbances in various parts of the country, and, in April 1220, to bring about the election of his young son Henry as king of the Romans. But for this favour he had been compelled to pay a high price. Seven years before, at Eger in July 1213, he had made extensive concessions to the church, undertaking to take no part in episcopal elections, thus surrendering the advantages gained by the concordat of Worms, and to allow to German bishops the right of appeal to Rome. Proceeding a step farther in the same direction, he now promised to erect no new toll-centre, or mint, on the lands of the spiritual princes, and to allow no towns to be built thereon. Thus the prelates possessed nearly all the rights of sovereigns, and regarded the pope in Italy and not the king in Germany as their head, a state of affairs which was fatal to the unity, nay, even to the existence of the Empire.
Having made peace with Henry, count palatine of the Rhine and brother of Otto IV., and settled a dispute about the lands of the extinct family of Zähringen in the south-west of the country, Frederick left Germany in August Germany in Frederick’s absence. 1220; engaged in his bitter contest with the Papacy and the Lombard cities, in ruling Sicily, and, after several real or imaginary delays, in fulfilling his crusading vow, he did not return to it for fifteen years. During this period he was represented by his son Henry, in whose name the government of Germany was carried on by the regent Engelbert, archbishop of Cologne. While Engelbert lived the country was in a fairly peaceable condition, although, thanks to the emperor’s concessions, the spiritual princes were predominant, and all possible means were taken to check the growth of the towns, whose interests and aspirations were not favourable to this state of affairs. There was, moreover, a struggle between Valdemar of Denmark and some neighbouring German nobles. But after Engelbert’s murder (November 1225) there was a change for the worse, and the only success which can be placed to the credit of the German arms during the next few years was the regaining of the lands ceded to Denmark in 1215, lands which included the cities of Hamburg and Lübeck. Under the rule of the new regent, Louis I., duke of Bavaria, confusion reigned supreme, and civil war prevailed in nearly every part of the country.
After the treaty of San Germano, which was made with Pope Gregory in 1230, and the consequent lull in the struggle with the Papacy, Frederick was able to devote some little attention to Germany, and in 1231 he sanctioned Rebellion of King Henry. the great Privilege of Worms. This was a reward to the princes for their efforts in bringing about the peace, and an extension of the concessions made in 1220. The princes, now for the first time referred to officially as domini terrae, were given full rights of jurisdiction over their lands and all the inferior officers of justice were made subservient to them. Practically they became independent sovereigns, and to make their victory more complete serious restraints were laid upon the freedom of the towns. Before this date King Henry had begun to take a personal part in the government and was already involved in a quarrel with Otto II., duke of Bavaria. He disliked the Privilege of Worms and, favouring the towns against the princes, his policy was diametrically opposed to that of the emperor; however, in 1232 he went to Italy and promised to obey his father’s commands. But in 1234, at a time of great and increasing disorder in Germany, he rebelled; he appealed publicly to the princes for support, gained some followers, especially in his own duchy of Swabia, and made an alliance with the Lombard cities. Confident of his strength Frederick entered Germany with a few attendants in the middle of 1235, and his presence had the anticipated effect of quelling the insurrection; Henry was sent a prisoner to Italy and disappeared from history. Then, in August 1235, amid surroundings of great splendour, the emperor held a diet at Mainz, which was attended by a large number of princes. This diet is very important in the legal history of Germany, because here was issued that great “land peace” (Landfrieden) which became the model for all subsequent enactments of the kind. By it private war was declared unlawful, except in cases where justice could not be obtained; a chief justiciar was appointed for the Empire; all tolls and mints erected since the death of Henry VI. were to be removed; and other provisions dealt with the maintenance of order.
In 1236, during another short stay in Germany, Frederick in person led the imperial army against Frederick II., duke of Austria, who had defied and overcome his representatives; having taken possession of Vienna and Frederick in Germany. the Austrian duchies he there secured the election of his son Conrad, who had already succeeded his brother as duke of Swabia, as king of the Romans (May 1237). But in spite of these imposing displays of power the princes looked with suspicion upon an emperor who was almost a stranger to their country and who was believed to be a renegade from their faith, and soon after Frederick’s return to Italy the gulf between him and his German subjects was widened by his indifference to a great danger which threatened them. This came from the Mongols who ravaged the eastern frontiers of the country, but the peril was warded off by the efforts of Henry II., duke of Silesia, who lost his life in a fight against these foes near Liegnitz in April 1241, and of Wenceslaus I., king of Bohemia.
The emperor’s attitude with regard to the Mongol invasion is explained by events in Italy where Frederick was engaged in a new and, if possible, a more virulent struggle with the Lombard cities and with Gregory IX. As usual, Frederick and the pope. the course of politics in Germany, which at this time was ruled by King Conrad and by the regent Siegfried, archbishop of Mainz (d. 1249), was influenced by this quarrel. Frederick of Austria had allied himself with Wenceslaus of Bohemia, and spurred on by the papal emissary had tried to set up a rival king; but both the Danish and the French princes who were asked to accept this thankless position declined the invitation, and Frederick and Wenceslaus made their peace, the former receiving back his duchies. After the defeat of the Mongols, however, there was again the danger of a rebellion based upon a union between the princes and the pope. Siegfried of Mainz deserted his master, and visiting Germany in 1242 Frederick found it necessary to purchase the support of the towns by a grant of extensive privileges; but, although this had the desired effect, Conrad could make but little headway against the increasing number of his enemies. At last the Papacy found an anti-king. Having declared Frederick deposed at the council of Lyons in 1245, Gregory’s successor, Innocent IV., induced a number of princes to choose as their king the landgrave of Thuringia, Henry Raspe, who had served as regent of Germany. This happened in May 1246, and the conduct of the struggle against the Pfaffenkönig, as Henry was called, was left to Conrad, who was aided by the Bavarians, until February 1247, when the anti-king died. The papal party then elected William II., count of Holland, as Henry Raspe’s successor, and during the state of anarchy which now prevailed in Germany the emperor died in Italy in December 1250.