Latin Emperor the suzerainty over the Duchy of Naxos, Negroponte (Euboea), and possibly over the Marquisate of Bodonitsa as well, while the County of Cephalonia also recognized his overlordship. William's hegemonic ambitions worried many of the other Latin rulers and barons, however, resulting in the War of the Euboeote Succession (1256–1258). Guy de la Roche fought against William in the conflict, but it ended in a complete victory for William and Guy's submission to the Prince of Achaea. Following the capture of William II by the Byzantines in the Battle of Pelagonia (1259), in 1261 the Byzantine emperor Michael VIII Palaiologos () received a number of fortresses in the southeastern Morea (Monemvasia, Mystras and Grand Magne, possibly also Geraki) as a ransom for the Prince's release. According to George Pachymeres, Argos and Nauplia were also demanded by Palaiologos, but in the event they remained in Latin hands. In the 1270s, with the rise of the Latin renegade Licario, who became a Byzantine admiral, the Argolid suffered repeated raids at the hands of Licario's corsairs. Under the Brienne family In 1309, Walter I of Brienne succeeded to the Duchy of Athens, but he and many of the most important lords of Frankish Greece fell in the Battle of Halmyros in March 1311 against the Catalan Company. In its aftermath, the Catalans took over the Duchy of Athens and, with the military capacity of the remaining Latin states of Greece crippled, threatened to invade the Morea and take over Argos and Nauplia as well. After briefly holding Athens against the Catalans, Walter's widow, Joanna of Châtillon, went to France to solicit aid from her father, the Constable of France Gaucher V de Châtillon, whom she appointed bailli in her name on 22 November 1312. Over the next few years, with support from the Angevin Kingdom of Naples and the Papacy, Joanna dispatched men and provisions to the Argolid, which was administered in her name by the local Frankish brothers Walter and Francis of Foucherolles. The steadfast loyalty of the Foucherolles to the Briennist claimants was instrumental in keeping the lordship under their control over the next decade, when the Argolid was ravaged by Catalan raids. The lordship's maintenance necessitated continuous expense, however, which forced Joanna to undertake large debts. When Joanna's son Walter II of Brienne came of age in January 1321, he initially refused to take over his mother's debts. King