Chaucer continued all through his life to find a powerful friend in John of Gaunt. To his influence he doubtless owed various offices, which he held at different times. He was several times sent abroad on secret affairs of state, and at last obtained a permanent office in London, with a salary, and besides had a pension granted to him. His connexion with John of Gaunt was strengthened by the fact that his wife's sister, Katherine Swynford, who had been in the service of the Duchess Blanche, first became the Duke's mistress, and afterwards his third wife.

The advantage of such a patron to the poet must have been great, as it relieved him from all anxiety about money, and permitted him to devote most of his energy to his art.

We cannot overestimate what Chaucer did for the English language. Before his time French was the common language of the court, the schools, the law courts, and all the higher classes of society. The dialects spoken in different parts of England differed widely from one another, and it remained a question which of these dialects should triumph and form the cultivated English language. It was Chaucer who decided this question. It was his language that was to become the standard of English. This was due to the force of his genius, which made men feel the beauty, the power, and the capacities of the language which he used, so that insensibly it became the language of all cultivated men. And as the English language developed, it triumphed over the French. One of the acts, which commemorated Edward III.'s jubilee, is an edict in which he said, that as the French tongue "was much unknown in the country," all pleas should be henceforth in English.

On the 14th November, 1362, Edward III. celebrated his jubilee; that is, his fiftieth birthday. In honour of the day he proclaimed a general pardon, and set all prisoners at liberty, and recalled all exiles. To commemorate it still further, he conferred various dignities upon his sons. Lionel was made Duke of Clarence; John of Gaunt was solemnly raised to the dignity of Duke of Lancaster. The king in full Parliament girt him with a sword, and set upon his head a cap of fur, and a circlet of gold and pearls. Edmund, the fourth son, was made Earl of Cambridge.

This was the climax of Edward's prosperity. On his fiftieth birthday he might look back upon his life, and say that fortune had indeed favoured him; but from henceforth things did not go so well. Misfortunes and troubles marked the last years of his life, and in the end he was destined to lose almost all that he had won. It is not difficult to see how this came about. Edward III. was a brave and accomplished knight, a man full of energy and interests, anxious to protect commerce and manufacture, to increase the wealth of his people, and to win glory for himself by his wars; but he had no great purpose in his life. He collected mighty armies, at an enormous expense, and led them into the enemy's country without any definite scheme of what he meant to do. His own bravery and that of his soldiers enabled him to win great victories; but not content with grasping firmly what he had once got, he indulged in an ambitious dream of one day winning the crown of France. Even when the peace of Bretigny had secured to him the great Duchy of Aquitaine, neither he nor the Black Prince had sufficient political wisdom to take such steps as would have preserved it for the English Crown. They had won it, but they could not keep it.

Over the joy of Edward's jubilee there hung no shadow of distrust for the future. The next year the Black Prince was to go and take up his abode in his new Duchy of Aquitaine, and the months before his departure were filled up with hunting parties in the royal forests, which were conducted with the greatest possible magnificence, and with no sparing of expense. The king and queen, with their children, spent Christmas at the Black Prince's manor of Berkhampstead, near London. Here were many jousts and tournaments, and all the usual Christmas games and festivities.

The general extravagance and love of dress must have increased to an alarming extent; for the next year is marked by a sumptuary statute, which aimed at diminishing extravagance and high prices. It decreed that each merchant was to deal only with one sort of merchandise, which he must choose before the feast of Candlemas. Handicraftsmen also were to practise only one "mystery," as the trades were then called, exceptions only being allowed in the case of women workers. The goldsmiths were to make their work sterling, and each master goldsmith was to have his own mark. His work must be assayed by the royal surveyors, who were to put the king's mark on it, and then the goldsmith was to put his own mark. No goldsmith might make both gold and silver plate. The prices at which he was to sell his work were fixed.

The statute went on to regulate matters of mere personal expenditure. It ordained that the poor were "to eat and drink in the manner that pertaineth to them, and not excessively;" that they were not to eat fish or meat more than once a day. "Seeing that various people wore clothing above their estate and degree," it ordained that the handicraftsmen and yeomen were not to wear cloth above a certain price, and no silk and embroidery, ribands or gold and silver ornaments. The ploughmen and all agricultural labourers were only to wear tunics of blanket or russet, with girdles of linen. Above all, no one except persons of the highest rank was to wear fur or pearls.

The statute was not prompted by any feeling of the evils of luxury amongst the ruling classes. About the time of its promulgation Archbishop Simon Islip issued a "Remonstrance against the abuses, the foppery, and extravagance of the court." The upper classes had no intention of reforming their own extravagance; but they wished to have the monopoly of all luxuries, and they fancied that the more extensive use of fine clothes and various kinds of victuals greatly increased their price. These sumptuary laws show with what bitter jealousy the nobility regarded the growing wealth and prosperity of the merchant classes.

The burghers of London were indeed becoming very rich and powerful. About this time Henry Picard, a vintner, the Lord Mayor of London, sumptuously feasted Edward III., the Black Prince, David Bruce (King of Scotland), the King of Cyprus (who had come to ask Edward's help against the Turks), and many nobles. Afterwards he kept open house to any who liked to play at dice or hazard with him, whilst his wife, the Lady Margaret, received the ladies in her upper room. The King of Cyprus engaged in play with Picard, and won fifty marks; but Picard was a good player, and soon won back more than he had lost, at which the King was much vexed. He tried to hide his irritation; but Picard saw it, and said to him, "My lord King, be not aggrieved, I covet not your gold but your play, for I have not bid you hither that I might grieve you, but that, amongst other things, I might try your play." Then he gave him his money back again, and distributed more among his servants. He gave also many rich gifts to Edward III., his son, and the knights who had dined with them.