Caerphilly Castle

Caerphilly Castle was built in the second half of the 13th century, as part of the Anglo-Norman expansion into South Wales. The Normans began to make incursions into Wales from the late 1060s onwards, pushing westwards from their bases in recently occupied England. Their advance was marked by the construction of castles and the creation of regional lordships.

In 1263, Gilbert de Clare, also known as "Red Gilbert" because of the colour of his hair, inherited the family lands. Opposing him in Glamorgan was the native Welsh prince Llywelyn ap Gruffudd. Llywelyn had taken advantage of the chaos of the civil war in England between Henry III and rebel barons during the 1260s to expand his power across the region. In 1265 Llywelyn allied himself with the baronial faction in England in exchange for being granted authority over the local Welsh magnates across all the territories in the region, including Glamorgan.

The bishops took possession of the castle later in 1271 and promised Llywelyn that building work would temporarily cease and that negotiations would begin the following summer. In February of the next year, however, de Clare's men seized back the castle, threw out the bishops' soldiers, and de Clare – protesting his innocence in these events – began work once again. Neither Henry nor Llywelyn could readily intervene and de Clare was able to lay claim to the whole of Glamorgan. Work on the castle continued, with additional water defences, towers and gatehouses added.