The capital of Gondor, Minas Tirith (Sindarin: "the Tower of Guard"), lay at the eastern end of the White Mountains, built around a shoulder of Mount Mindolluin. The city was originally called "Minas Anor", "the Tower of the Sun", alongside "Minas Ithil", "the Tower of the Moon" in Ithilien on the other side of the River Anduin. The city is sometimes called "the White Tower", a synecdoche for the city's most prominent building in its Citadel, the seat of the city's administration. The head of government is the Lord of the City, a role fulfilled by the Stewards of Gondor. Other officials included the Warden of the Houses of Healing and the Warden of the Keys. The Warden of the Keys was in charge of the city's security, especially its gates, and the safe-keeping of its treasury, notably the Crown of Gondor; he had full command of the city when it was besieged by the forces of Mordor.