Wales Beaumaris, Caernarfon and Conwy. His son, the future Edward II, was born at Edward's new castle at Caernarfon in 1284. He became the first English Prince of Wales in 1301, which at the time provided an income from northwest Wales known as the Principality of Wales. The title is granted by the monarch to the heir apparent as a personal honour or dignity, and is not heritable, merging with the Crown on accession to the throne. After the failed revolt in 1294–95 of Madog ap Llywelyn – who styled himself Prince of Wales in the Penmachno Document – and the
Prince of Wales due to its association with her predecessor, Diana. The longest-serving Prince of Wales is the title's current holder, Queen Elizabeth II's son Charles. He is also the longest-serving heir apparent in British history. Prince of Wales Prince of Wales () was a title granted to princes born in Wales from the 12th century onwards; the term replaced the use of the word "king". One of the last Welsh princes, Llywelyn ap Gruffudd, was killed in battle in 1282 by Edward I, King of England, whose son Edward (born in Caernarfon Castle in 1284) was invested as the first English Prince