The Assizes of Romania (French: Assises de Romanie), formally the Book of the Usages and Statutes of the Empire of Romania (Venetian: Libro de le Uxanze e Statuti de lo Imperio de Romania),[1] is a collection of laws compiled in the Principality of Achaea that became the common law code of the states of Frankish Greece in the 13th–15th centuries, and continued in occasional use in the Venetian Ionian Islands until the 18th century.