... about 1200, and then it was given back to the Lord of Gower. The Lord of Gower owned Oystermouth Castle after 1200 until about 1330 and the family was called the de Braose family. Alionara de Mowbray was the last of the de Broase family; she married into the de Mowbray family. The locations of castles were vital, as castles needed to be on high land, or on the edge of an impregnable cliff to give a commanding view of the surrounding area. It was important that every castle was half a day's march from each other (approximately 3-6 miles) this was because if there was an invasion, then they could help defend the surrounding castles. Whereas, if the castles were miles away from each other, then they wouldn't be able to have a defense system, resulting in the castles over time quickly being taken over. William the Conqueror ...

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