Edward I "Longshanks":
Edward built a series of impressive castles across Wales (such as Conwy Castle and Caernarfon Castle) and in 1284 Edward issued the Statute of Rhuddlan that effectively annexed Wales and made it a province of England. The title Prince of Wales was handed to Edward's eldest son, Prince Edward (later Edward II) – a practise that continues to this day. BBC History
Conwy Castle is a World Heritage site.