It was on his return from this trip that he committed the gravest fault of his reign, a fault which was destined to bring upon France and the French kingship even more evils and disasters than those which had made the treaty of Bretigny a necessity.

In 1362, the young Duke of Burgundy, Philip de Louvre, the last of the first house of the Dukes of Burgundy, descendants of King Robert, died without issue, leaving several pretenders to his rich inheritance.

King John was, according to the language of the genealogists, the nearest of blood, and at the same time the most powerful; and he immediately took possession of the duchy, went, on the 23d of December, 1362, to Dijon, swore on the altar of St.Benignus that he would maintain the privileges of the city and of the province, and, nine months after, on the 6th of September, 1363, disposed of the duchy of Burgundy in the following terms: "Recalling again to memory the excellent and praise-worthy services of our right dearly beloved Philip, the fourth of our sons, who freely exposed himself to death with us, and, all wounded as he was, remained unwavering and fearless at the battle of Poitiers.

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