In July 1551, at Martinuzzi’s instigation, Isabella ceded Transylvania and the part of Hungary that remained in her hands to Ferdinand, in exchange for the towns of Ratibor and Oppeln in Silesia, and the Austrian troops, under the command of the Spaniard Castaldo, took possession of these territories.[279] When Solyman heard this news, he summoned Malvezzi before him, who pledged his life that there was no ground for this report; but, as he could not give satisfactory explanations, and fell back on the insufficiency of his instructions, he was thrown into prison in the Black Tower of the Castle of Anatolia on the Bosphorus,[280] the Sultan excusing this violation of international law by the argument that an ambassador was a hostage for the good faith of his master, and should suffer for any breach of it. From this incident it appears that the post of ambassador at the Porte was by no means unattended with danger.
Ferdinand rewarded Martinuzzi by procuring for him a Cardinal’s hat, and appointing him Archbishop of Gran. Not content with these dignities, that wily politician made overtures to the Turks, with the object of gaining the sovereignty of Transylvania and Hungary for himself; but he was assassinated by Castaldo’s officers acting under Ferdinand’s orders, or, at any rate, with his connivance, at Alvincz, December 18, 1551.
In 1552 the Turks recommenced their attacks on Hungary, which were attended with almost uniform success. In February they gained a victory at Szegedin; in April, Wessprim was taken by Ali, the Pasha of Buda; and in July Temeswar fell. Its capture was followed by the loss of the rest of the Banat. On August 11, Ali Pasha defeated an army of Ferdinand’s at Fülek, to the north of Buda, Sforzia Pallavicini was taken prisoner, and Sbardellatus Dudich, the Bishop of Waitzen, whom Busbecq calls by mistake the Bishop of Fünfkirchen, was killed.[281] Erlau, however, was besieged by Ali unsuccessfully.
In April 1552, Ferdinand wrote to Roostem, the Grand Vizier, asking for Malvezzi’s release, and for a safe conduct for two more envoys. In consequence, Malvezzi was removed to the Seven Towers, and his allowance was increased; but he was still kept in close confinement.
Fortunately for Ferdinand at this critical juncture, a Persian invasion and the Sultan’s domestic troubles created a diversion in his favour. In 1553 the Sultan, on account of the mutinous disposition of the army, which had been sent to defend Armenia against the Persians, was obliged to take command of it in person. The most notable event of the campaign was the tragical end of Mustapha, Solyman’s eldest and most promising son. The story of his cruel murder is narrated in pathetic words by our author in his first letter,[282] though he is mistaken in placing the scene of it near Amasia, as Eregli, in Karamania, where it really happened, is about 250 miles from that city. To appease the indignation of the soldiery at the death of their favourite, the Grand Vizier Roostem was deposed, and his office conferred on Achmet Pasha. Busbecq, during his visit to Amasia, in 1555, witnessed the conclusion of peace between the Sultan and the Shah.
The Persian war relieved for a time the pressure on Hungary. Solyman granted a six months’ armistice, and Francis Zay and Antony Wranczy or Verantius, then Bishop of Fünfkirchen, and afterwards Bishop of Erlau, were sent as envoys to Constantinople.[283] They arrived in August. They were instructed to offer a tribute of 150,000 ducats for Hungary Proper, and 40,000 for Upper Hungary and Transylvania. The Viziers, however, told them that the abandonment of all claims to Transylvania was an indispensable preliminary to opening negotiations. Malvezzi was accordingly released, and sent to Vienna to receive further instructions from Ferdinand; and it was arranged that the peace should be prolonged for five years, and that on account of the loss of territory Ferdinand had sustained in Hungary the annual present or tribute should be reduced to 15,000 ducats. The peace was not to be ratified till Malvezzi’s return, but the truce was prolonged in the meanwhile.
In May, 1554, Malvezzi was ordered to return, but he was prevented by illness, and Busbecq was sent in his stead.[284] He arrived at Constantinople on January 20, 1555, and proceeded in March, with Verantius and Zay, to the Sultan’s headquarters at Amasia. They brought him a present of gilded cups, and 10,000 ducats as tribute for Transylvania. They complained of the numerous breaches of the armistice on the part of the Turks, but, although they promised 80,000 ducats to the Sultan and large sums to the chief viziers, they could only obtain an extension of the armistice for six months, and a letter from Solyman to Ferdinand, with which Busbecq was sent to Vienna.
On September 28, 1555, Achmet was executed, and Roostem reappointed Grand Vizier.[285]
Notwithstanding the truce of Amasia, guerilla raids on both sides continued all along the Hungarian frontiers. To check the incursions of the Heydons, Touighoun, the Pasha of Buda,[286] attacked and took Babocsa; and Ali, his successor, the victor of Fülek, with the same object, commenced the siege of Szigeth, on May 24, 1556, and assaulted the place a month later, but was repulsed with heavy loss. In the meantime the Palatine Nadasty had besieged Babocsa, and Ali hastened with a detachment to relieve it, but was defeated with great loss on the river Rinya (July 25). Babocsa was then abandoned by the Turks, and fell into the hands of the Hungarians, who burnt it, and blew up the citadel. Ali resumed the siege of Szigeth, but was so weakened by his defeat, that he was obliged to raise it, retreating to Buda, where he died soon afterwards.[287] The fall of Szigeth was thus postponed for ten years, when it was destined to be associated with the termination of a more glorious career, and the extinction of a more famous name.[288]
Meanwhile Transylvania had again passed into the possession of Isabella and her son. She had at first gone to the Silesian duchies, which Ferdinand had given in exchange for Transylvania; but she was dissatisfied with them, and returned to her brother’s court in Poland, where she entered into correspondence with her partisans in Transylvania. The current of feeling there ran strongly in her favour. The Spaniard, Castaldo, Ferdinand’s governor, was ignorant of the national laws and usages. His troops were left unpaid, and supported themselves by plundering the country. At last one corps after another mutinied for their pay, and marched out of Transylvania; and Castaldo himself, unable to check the dissolution of his army, withdrew to Vienna. For a time anarchy prevailed in Transylvania; but in June, 1556, the inhabitants resolved to recall Isabella and her son. The envoys found her at Lemberg, and invited her to return. The Voivodes of Moldavia and Wallachia entered Hungary to protect her passage, and on October 22 she and her son entered Klausenburg in triumph.[289]