Why was Scarborough castle built?

Scarborough Castle was built primarily for defense and strategic military purposes. Constructed in the 12th century by William le Gros, it was positioned on a prominent cliff overlooking the North Sea, providing a stronghold against invasions and a base for controlling the surrounding area. Its location also allowed for effective surveillance of maritime activities along the coast. Over the centuries, it played a significant role in various historical conflicts, including during the English Civil War.