In 1314, Philip IV died abruptly in a hunting accident at the age of 47 and the throne passed to his son Louis X (1314–1316). Louis's brief reign saw further unsuccessful attempts to assert control over Flanders as the king mobilized an army along the border, but supply problems caused the effort to break down. Louis died in the summer of 1316 at only 26 of an unknown illness (possibly gastroenteritis) after consuming a large quantity of chilled wine following a game of tennis on an extremely hot day. The king's wife was then pregnant and gave birth to a son, John, in November, but he died after a week and the throne passed to his brother Philip.