quaestor UK /ˈkwiːstə/US /ˈkwestəɹ/ noun3 •(historical) An ancient Roman official responsible for public revenue and other financial affairs.Decoratus was quaestor in A.D. 508. — 1969 •(historical) The Quaestor sacri palatii of the late Roman Empire and Byzantium; first generally a legislator, then judicial official, and eventually an honorary title by the 14th century. •(historical) In the Middle Ages, an officer who announced indulgences. formsquaestors