Llywelyn ap Gruffudd (c. 1223 11 December 1282), sometimes written as Llywelyn ap Gruffydd, also known as Llywelyn the Last (Welsh: Llywelyn Ein Llyw Olaf, lit.'Llywelyn, Our Last Leader'), was the native Prince of Wales (Latin: Princeps Walliae; Welsh: Tywysog Cymru) from 1258 until his death at Cilmeri in 1282. Llywelyn was the son of Gruffydd ap Llywelyn Fawr and grandson of Llywelyn the Great, and he was one of the last native and independent princes of Wales before its conquest by Edward I of England and English rule in Wales that followed.

The Battle of Orewin Bridge (also known as the Battle of Irfon Bridge) was fought between English (led by the Marcher Lords) and Welsh armies on 11 December 1282 near Builth Wells in mid-Wales. It was a decisive defeat for the Welsh because their leader, Llywelyn ap Gruffudd was killed, and this effectively ended the autonomy of Wales.