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.
^Specifically, he claimed to be the son of Coel, son of Gweirydd, son of Cynwrig, son of Cynddelw Gam, son of Elgudy, son of Gwrysnadd, son of Dwywg Lythyr, son of Tegog, son of Dwyfnerth, son of Madog, son of Madog Gwyn, son of Mechydd, son of Sandde.