without incident, it was probably secured earlier. Papal sanction of the marriage appears to have required the founding of two monasteries in Caen – one by William and one by Matilda. The marriage was important in bolstering William's status, as Flanders was one of the more powerful French territories, with ties to the French royal house and to the German emperors. Contemporary writers considered the marriage, which produced four sons and five or six daughters, to be a success. Appearance and character No authentic portrait of William has been found; the contemporary depictions of him on the Bayeux Tapestry and on his seals and coins are conventional representations designed to assert his authority. There are some written descriptions of a burly and robust appearance, with a guttural voice. He enjoyed excellent health until old age, although he became quite fat in later life. He was strong enough to draw bows that others were unable to pull and had great stamina. Geoffrey Martel described him as without equal as a fighter and as a horseman. Examination of William's femur, the only bone to survive when the rest of his remains were destroyed, showed he was approximately in height. There are records of two tutors for William during the late 1030s and early 1040s, but the extent of his literary education is unclear. He was not known as a patron of authors, and there is little evidence that he sponsored scholarships or other intellectual activities. Orderic Vitalis records that William tried to learn to read Old English late in life, but he was unable to devote sufficient time to the effort and quickly gave up. William's main hobby appears to have been hunting. His marriage to Matilda appears to have been quite affectionate, and there are no signs that he was unfaithful to her – unusual in a medieval monarch. Medieval writers criticised William for his greed and cruelty, but his personal piety was universally praised by contemporaries. Norman administration Norman government under William was similar to the government that had existed under earlier dukes. It was a fairly simple administrative system, built around the ducal household, which consisted of a group of officers including stewards, butlers, and marshals. The duke travelled constantly around the duchy, confirming charters and collecting revenues. Most of the income came from the ducal lands, as well as from tolls and a few taxes. This income was