Pierreval () is a commune in the Seine-Maritime department in the Normandy region in northern France. Geography A small farming village situated some northeast of Rouen at the junction of the D15 and the D122 roads. The A28 autoroute forms the northwest border of the commune. Population Places of interest The church of St.Martin, dating from the thirteenth century. People Marie Juliette Louvet, grandmother of prince Rainier III of Monaco, was born here in 1867. See also Communes of the Seine-Maritime department References Communes of Seine-Maritime