<answer>John</answer> grew up to be around 5 ft 5 in (1.68 m) tall, relatively short, with a "powerful, barrel-chested body" and dark red hair; he looked to contemporaries like an inhabitant of Poitou. <answer>John</answer> enjoyed reading and, unusually for the period, built up a travelling library of books. He enjoyed gambling, in particular at backgammon, and was an enthusiastic hunter, even by medieval standards. He liked music, although not songs. <answer>John</answer> would become a "connoisseur of jewels", building up a large collection, and became famous for his opulent clothes and also, according to French chroniclers, for his fondness for bad wine. As <answer>John</answer> grew up, he became known for sometimes being "genial, witty, generous and hospitable"; at other moments, he could be jealous, over-sensitive and prone to fits of rage, "biting and gnawing his fingers" in anger.[nb 3]
Who became a connoisseur of jewels?
John