 The only Marquis to seriously consider using his Byzantine connection was Theodore's son, John II of Montferrat, who wished to take advantage of the Byzantine civil war of 1341–1347, between Andronikos II's great-grandson John V and John VI Kantakouzenos, in order to invade the empire and conquer Thessaloniki.In his will from 1372, John II claimed that Andronikos II's deposition in 1328 by his grandson Andronikos III (John V's father) had been unlawful and thus disqualified Andronikos III and all his heirs from the legitimate line of succession to the throne of Byzantium.John II also pointed out that since Andronikos II had disinherited Andronikos III, John II was thus the rightful emperor as the only true heir to Andronikos II.