What was his rules for building the exeter castle?

The rules for building Exeter Castle, established by its founder, were centered around ensuring strong defensive capabilities and strategic location. The castle was designed to utilize the natural topography for protection, with thick stone walls and a keep for security. Additionally, it emphasized the integration of residential and military functions, allowing it to serve both as a fortress and a noble residence. Overall, the focus was on durability, defense, and a commanding view of the surrounding area.