a guard who dresses in a traditional uniform at the Tower of London Culture Beefeaters are thought to have existed since the White Tower was built in the 11th century. They wear a red uniform from the Tudor period similar to that worn by the Yeomen of the Guard. For visitors to London, they are often seen as one of the symbols of the city. Word Origin early 17th cent. (originally a derogatory term for a well-fed servant): the current sense dates from the late 17th cent.