York has, since Roman times, been defended by walls of one form or another. To this day, substantial portions of the walls remain, and York has more miles of intact wall than any other city in England. They are known variously as York City Walls, the Bar Walls and the Roman walls (though this last is a misnomer as very little of the extant stonework is of Roman origin, and the course of the wall has been substantially altered since Roman times). The walls are generally 13 feet (4m) high and 6 feet (1.8m) wide.
Although much of Bootham Bar was built in the 14th and 19th centuries, it also has some of the oldest surviving stonework, dating to the 11th century. It stands almost on the site of porta principalis dextra, the north western gate of Eboracum. It was named in the 12th century as barram de Bootham, meaning bar at the booths, after the nearby market booths. It was the last of the bars to lose its barbican, which was removed in 1835.