Sillé-le-Guillaume () is a commune in the Sarthe department in the region of Pays de la Loire in north-western France, named after Guillaume de Sillé. In the fifteenth century the lord of the manor was Sir John Fastolf of Caister in Norfolk (1380–1459), following the English conquest of Normandy and Maine. See also Communes of the Sarthe department Parc naturel régional Normandie-Maine References Bibliography Communes of Sarthe