FitzNigel, Richard (d. 1198). Bishop of London (1189-98) and treasurer of England (c. 1158-98). A member of the outstanding family who developed the sophisticated 12th-cent. English administrative system, he was son of Nigel, bishop of Ely, treasurer, and nephew of Henry II's justiciar, Roger of Salisbury. He is chiefly remembered for writing the Dialogus de Scaccario (Dialogue of the Exchequer).