Use "fiat" in a sentence

1. His disciple Kenzei elaborated on the claim, saying that after the death of Ejō, Gien occupied the abbacy by fiat while Gikai was in the city of Kamakura.

Son disciple Kenzei développe cette version, disant qu'après la mort d'Ejō, Gien occupe l'abbaye fiat tandis que Gikai est dans la ville de Kamakura.