lord's private apartments. The west tower is almost internal, barely projecting beyond the rounded corner of the curtain wall, and could only be entered via the parapet walk. The basement level contains a pit prison which was accessed from above. The east tower was almost completely rebuilt in the late 15th century as a gatehouse. Each tower was probably once topped by a conical roof. The gatehouse The gatehouse was built by the Campbells in the late 15th century, replacing an earlier round tower in the east corner. It takes the form of a four-storey harled tower house, with the entrance passage running through half the vaulted basement, the other half forming guard rooms with arrow slits facing the gate. The present approach to the gate is by a stone stair, replacing an earlier drawbridge. The tower was remodelled in the 18th century to provide reception rooms and a private suite. The dormer windows at the top are capped by the pediments from the 1725 house (see below), and bear the date, the Campbell arms, and the initials AEC and DLC, for Aeneas Campbell, 11th Captain, and his wife Dame Lilias. The pediments were moved here during the 1903 restoration works. Internal ranges The east range was located between the north and east towers, although only foundations remain. This was the principal range of buildings and contained a large hall above vaulted cellars. The hall had double-lancet windows, decorated with carved patterns, which were later blocked up; their outlines can be seen in the east curtain wall. A second range stood along the north-west wall, and would have been connected to the hall range by the donjon tower. The ground floor housed a kitchen. In 1725 the range was remodelled into a two-storey house, accessed via a stone stair, and topped with the dormer windows which now form part of the gatehouse. The well in front is original, although the large stone surround is of 19th century date. Dunstaffnage Chapel A ruined chapel lies around to the south-west of the castle. This was also built by Duncan MacDougall of Lorn, as a private chapel, and features detailed stonework of outstanding quality. Experts believe that the chapel was built in the second quarter of the 13th century. The chapel is , and formerly had a timber roof. The lancet windows carry dog-tooth carving, and have fine wide-splayed arches internally. The chapel