Now the undisputed Prince of Achaea, Philip sent to the Morea as his bailli Guy's brother Louis, Count of Conversano. By this time, the Catalans of Athens had entered a period of decline and civil war, which only somewhat subsided with the appointment of Matthew of Peralta as vicar-general in 1370. The Enghiens saw a perfect opportunity to reclaim their ancestral inheritance: on 28 March 1370 a third brother, John of Enghien, Count of Lecce, received permission from Queen Joanna I of Naples to gather 1,000 foot and 500 horse for service in Greece, and began arranging for ships to ferry them along the southeastern coasts of Italy. Guy also arranged a truce with the Despot of the Morea so as to concentrate his forces against the Catalans. As Venetian citizens, the Enghiens also approached Venice for aid, which was politely but firmly declined, first in April 1370, and again in February 1371. Undeterred, the Enghiens launched an invasion of Attica in spring 1371, but the campaign failed as the Acropolis resisted and Louis fell ill. The Enghiens retreated, and Guy concluded a truce with the Catalans in August; a marriage between his daughter and heir Maria and Joan de Llúria (probably the son of the former Catalan vicar-general Roger de Llúria) was initially stipulated in the agreement, but never actually took place. This was to be the last effort by the claimants, for troubles in Italy occupied Guy's brothers, and the looming Ottoman threat forced the Papacy to shift to a policy of supporting the Catalans. Any prospects to regain the Athenian duchy were further impeded by the capture of Megara by the ambitious Nerio I Acciaioli in 1374/75, which barred the land route into Attica to the Enghiens. Guy of Engien died shortly after October 1376. As his daughter Maria was underage and unmarried, the Lordship was governed by his brother Louis as her guardian. Louis arranged Maria's marriage to the Venetian Pietro Cornaro in May 1377. Louis seems to have launched some raids against the Catalans in 1377, but this was overshadowed by the fall of the Duchy of Athens to the Navarrese Company in 1379. Takeover by Venice The Cornaro family had been established in Latin Greece for some time, acting both as the Republic of Venice's officials and on their own account, and Pietro's father Federico was accounted the richest man in Venice in 1379.