vassallo faciendo superiori quod de jure facere oportet
vassallo faciendo superiori quod de jure facere oportet (vas-[schwa]-loh fay-shee-en-doh s[y]oo-peer-ee-or-I kwod dee joor-ee fay-s[schwa]-ree [ schwa]-por-tet). [Law Latin] Hist. Upon the vassal performing that to the superior which, according to law, he ought to perform.