The Constables and Governors of Windsor Castle are in charge of Windsor Castle in England on behalf of the sovereign. The day-to-day operations are under the Superintendent, who is an officer of the Master of the Household's Department of the Royal Household. There was a Deputy Constable and Lieutenant-Governor from 1833 to 1989. From 1964 he was also Governor of the Military Knights of Windsor, until the office was abolished in 1989. At one time there was also a separate Constable of the Round Tower. From 1928 to 1935 this was held jointly with the post of Deputy Constable.