Robert de Tosny was a notable figure in the 11th century, known for his role as a Norman nobleman. He was a supporter of William the Conqueror during the Norman Conquest of England in 1066. His loyalty and military service earned him significant land and titles in England. After the conquest, Robert de Tosny was granted lands in Warwickshire and Leicestershire. He is often remembered for his contributions to the establishment of Norman rule in England and his involvement in the construction of various castles, which helped solidify Norman power in the region.