Iolani Barracks, or Halekoa (house [of] warriors) in Hawaiian, was built in 1870, designed by the architect Theodore Heuck, under the direction of King Lot Kapuaiwa. Located directly adjacent to Iolani Palace in downtown Honolulu, it housed about 80 members of the monarch's Royal Guard until the overthrow of the Monarchy in 1893. It was added to the National Register of Historic Places in 1978 as part of the Hawaii Capital Historic District.