Cessford Castle is a large ruined mid-15th century L-plan castle near the village of Cessford, midway Jedburgh and Kelso. It1 was built around 1450 by Andrew Ker, 1st Earl of Roxburghe. It is possible that the castle incorporates parts of an earlier structure. The fortalice was built on an L-plan, with a main keep with a wing of almost the same magnitude. With up to six storeys, two of which were barrel vaulted, and with walls up to 4 m thick, it was a formidable place of defence. The castle was besieged in 1523 by the Earl of Surrey. The castle was abandoned in 1650.
References:Celje Castle was once the largest fortification on Slovenian territory. The first fortified building on the site (a Romanesque palace) was built in the first half of the 13th century by the Counts of Heunburg from Carinthia on the stony outcrop on the western side of the ridge where the castle stands. It had five sides, or four plus the southern side, which was a natural defence. The first written records of the castle date back to between 1125 and 1137; it was probably built by Count Gunter. In the western section of the castle, there was a building with several floors. Remains of the walls of this palatium have survived. In the eastern section, there was an enclosed courtyard with large water reservoirs. The eastern wall, which protects the castle from its most exposed side, was around three metres thicker than the rest of the curtain wall. The wall was topped with a parapet and protected walkway.