How Does the Site of Sandal Castle?

How far does the site of Sandal Castle and other sources help you to understand the way in which Castles changed and developed over time?
Castles were built in Britain for a number of reasons. One of them was so kings and other members of royalty could stay there whilst they travelled around the country. Another reason is that castles were good because they were an established base in times of war. For example, King Richard III used Sandal Castle as a base in the War of the Roses. Earls, Soldiers and many others also used them. As the population of the area grew, the castle became part of the community. For example it was allowed to hold two fairs so castles were also needed for this.
<Tab/>Over time castles changed appearance significantly. Some had dramatic changes like motte and bailey castles, some were built out of wood and as they became more important they were built out of stone. …