Having been informed that his daughters-in-law were engaging in adultery with two knights – according to some sources, he was told this by his own daughter, Isabella – he allegedly caught two of them in the act in 1313, and had all three shut up in royal prisons. Margaret (1290–1315), the wife of his eldest son and heir apparent, Louis X and I (1289–1316), had borne her husband only a daughter at this time, and the paternity of this girl, Joan, was with her mother's adultery now suspect. Accordingly, Louis – unwilling to release his wife and return to their marriage – needed to remarry. He arranged a marriage with his cousin, Clementia of Hungary (1293–1328), and after Queen Margaret conveniently died in 1315 (strangled by order of the King, some claimed), he swiftly remarried to Clementia. She was pregnant when he died a year later, after an unremarkable reign; uncertain of how to arrange the succession (the two main claimants being Louis' daughter Joan – the suspected bastard – and Louis' younger brother Philip (1293–1322), Count of Poitiers), the French set up a regency under the Count of Poitiers, and hoped that the child would be a boy. This proved the case, but the boy – King John I (1316), known as "the Posthumous" – died after only 5 days, leaving a succession crisis. Eventually, it was decided based on several legal reasons (later reinterpreted as Salic Law) that Joan was ineligible to inherit the throne, which passed to the Count of Poitiers, who became Philip V. He, however, produced no surviving sons with his wife, Countess Joan II of Burgundy (1291–1330), who had been cleared of her charges of adultery; thus, when he died in 1322, the crown passed to his brother, Charles (1294–1328), Count of La Marche, who became Charles IV; the County of Burgundy, brought to the Capetians by the marriage of Joan and Philip V, remained with Joan, and ceased to be part of the royal domains.