Llywelyn ab Iorwerth and King John's illegitimate daughter Joan had one son, Dafydd. Llywelyn had another son, Gruffudd, but he was determined to ensure that his entire principality would be ...

Support for Llywelyn in northern Glamorgan alarmed Gilbert de Clare, the powerful Lord of Glamorgan, who built Caerphilly Castle to thwart the Prince's ambitions The principality of Wales ruled by ...