1543–44. It is now roofless but still standing up to tall, and covers , almost as big as the largest of the Device Forts at Deal in Kent. The first tower on the site was built from fine-grained yellow sandstone, with the later expansion making use of both yellow and grey sandstone, with imported Caen stone being used for the finer detailing. Ironstone, siltstone and brown sandstone rubble and boulders was used for the core of the castle walls, some of it taken from the local cliffs. The castle would have been entered through the entrance bastion. The core of this building was constructed in the second phase of work on the castle and was initially a square one-storey construct, across, before being extended forward by an additional to form a circular bastion; an additional floor was then added on top in the third phase. The internal walls have mostly been destroyed, but the ground floor chambers would have been used for administration, and possibly as living rooms for the deputy captain. The first floor would have formed a high-status set of chambers for the use of the captain, and included large windows, fireplaces and a private garderobe, but most of this storey has been destroyed. A special German cocklestove was probably fitted into the chambers for the use of Philip Chute, the first captain of the castle, and was illustrated with pictures of Landsknecht soldiers and Protestant German leaders; only fragments of the stove have survived. In the centre of the fortification was the keep, built up from the round tower of 1512–14, and of the original building's walls were incorporated into the new design. The original tower had ten gunports embedded at ground level in its walls, but these were blocked up in the second phase of building. The keep would originally had a parapet running around its roof, which was initially flat but converted to a ridged design in the third phase of work. The ground floor was laid in brick and had a brick and stone-lined well to supply it with water. The keep had two fireplaces, but these were small and not intended for cooking – indeed, the final version of the keep was probably never used as a living space. The first floor windows were added in the final phase of work; they were not intended for use as gunports, but they had bars