 Deslaur, however, proved ineffective as a defender of the Catalan conquests.Menaced by the Venetian colony of Negroponte and the Frankish Morea, he negotiated the handover of suzerainty to Frederick II of Sicily, who appointed his young son Manfred duke (1312).Frederick sent Berenguer Estañol to act as Manfred's vicar general and Deslaur stepped down from his post as leader of the Company and duke of Athens, retiring to his castle at Salona, which he either escheated, or he was forced to relinquish, to Alfonso Fadrique around 1318.