Marculf (mär`kŭlf'), fl. 7th cent., Frankish monk. He compiled the Marculfi monachi formulae [formularies of Marculf], usually dated c.650. Formularies were model forms of official documents for the use of the church, the state, and private individuals, and were used as manuals in chanceries. Marculf's is one of the best collections and is invaluable to scholars.