Mingarry Castle was considered a strategically important site in terms of communication with overseas areas and as an entranceway to the Sound of Mull. Originally built in the 13th century for the Clan MacDonald of Ardnamurchan, the castle has had many different occupants. King James IV of Scotland used it as a stronghold for fighting off Clan Donald in the late 15th century. In 1515 the castle was besieged by the Clan MacDonald of Lochalsh and again two years later when they finally took the castle.
In 1588 the chief of the Clan MacLean of Duart resided there after capturing the chief of the Clan MacIan of Ardnamurchan. In 1588, one of the ships of the Spanish Armada, named the San Juan de Sicilia, landed on Mull and MacLean of Duart used troops from the ship to aid him in his warring against the MacDonalds of Clanranald and the MacIans of Ardnamurchan. On one occasion, a force from the ship besieged to the castle for three days before withdrawing.
Other occupants over the years included the Clan Campbell, the Earls of Argyll (in 1612), and Alasdair Colkitto MacDonald who fought the English Parliamentarians of Oliver Cromwell in 1644. The majority of the current building dates from the 17th century onwards. Mingarry is roughly hexagonal in shape with nine-foot-thick walls, thicker on the seaward side.References:
The city walls of Avila were built in the 11th century to protect the citizens from the Moors. They have been well maintained throughout the centuries and are now a major tourist attraction as well as a UNESCO World Heritage Site. Visitors can walk around about half of the length of the walls.
The layout of the city is an even quadrilateral with a perimeter of 2,516 m. Its walls, which consist in part of stones already used in earlier constructions, have an average thickness of 3 m. Access to the city is afforded by nine gates of different periods; twin 20 m high towers, linked by a semi-circular arch, flank the oldest ones, Puerta de San Vicente and Puerta del Alcázar.