There is no information remaining concerning Giles between the period of 1277 and 1281, when he returned to Italy. However, in 1281, at the Thirty-sixth Council of Paris, in which several differences between the bishops and mendicant orders were dealt with, he sided with the bishops against the mendicants. In reference to this, a contemporary philosopher, Godfrey of Fontaines mentioned Giles as the most renowned theologian of the whole city ("qui modo melior de totâ villâ in omnibus reputatur"), suggesting that he might have been in Paris during this period before going back to Rome.