He was first proclaimed vicar general by his father in 1317 and sent off to govern Athens on behalf of his younger half-brother Manfred.
He arrived in Piraeus with ten galleys later that year, but Manfred had died and was succeeded by another brother, William II.
[1] In the year of his arrival, Fadrique married Marulla, the daughter of Boniface of Verona, thus allying himself with the chief lord of Euboea.
Over the next two years, Fadrique warred with the Republic of Venice and stormed the city of Negroponte with Turks after Boniface of Verona died.
He took possession of his castles at Zetouni and Gardiki and conquered Neopatras, Siderokastron, Loidoriki, Domokos, and Pharsalus.