Latinized form of Roul, the Old French version of Rolf. This form appears regularly in Latin documents of the Middle Ages, but does not seem to have been used in everyday vernacular contexts. It is the form by which the first Duke of Normandy (c.860–932) is generally known. He was a Viking who, with his followers, settled at the mouth of the Seine and raided Paris, Chartres, and elsewhere. By the treaty of St Clair he received the duchy of Normandy from Charles III, on condition that he should receive Christian baptism. Use of this name in English families in modern times seems to be a consciously archaistic revival.