where is it located?
France.
Bayeux
Bayeux () is a commune in the Calvados department in Normandy in northwestern France.

who is william de st-calais? A medieval Norman monk. where was he born? Bayeux.
wiki:4750328
Bayeux [SEP] Introduction
Bayeux () is a commune in the Calvados department in Normandy in northwestern France. Bayeux is the home of the Bayeux Tapestry, which depicts the events leading up to the Norman conquest of England. It is also known as the first major town secured by the Allies during Operation Overlord. Charles de Gaulle made two famous speeches in this town.