Llywelyn Aurdorchog (Welsh: "of the Golden Torc"; Latin: Torquatus; c. 1005 - c. 1065) was a Welsh noble who served as the penteulu ("War-chief") and Prime Minister of the King of Wales, Gruffydd ap Llywelyn.
He was rewarded with the Lordship of Ial (English: "Yale") and Ystrad Alud, two commotes in northeast Powys. His arms were azure, a lion rampant guardant or.[1] [2]
Llywelyn traced his ancestry to Sandde, a different son of Llywarch Hen from that claimed by the kings of Gwynedd and Deheubarth.[3]
His eldest son Llywelyn Fychan inherited his domain around the year AD 1065. His other sons were Iorwerth, Idris, Dolfyn, and Ednywain.[4] His daughter Agnes wed Uchdryd ap Edwin Tegeingl, who was lord of Cyfeiliog and Meirion.[2]