The lorwerth Clan is one of the eight elven clans that once inhabited Prifddinas. At the End of the God Wars, Seren, the goddess of the elves, was forced to leave Gielinor. The Cadarn Clan departed from Tirannwn in the Fourth Age to seek peace with the Gnomes, Humans and Ogres at the other side of the mountains (currently Kandarin).
With most of the military gone, the Iorwerth Clan, led by Lord Iorwerth, conquered Prifddinas. Many elves died and the remaining clans had to flee into Isafdar. They are still hiding in camps like Lletya.
Currently, the Iorwerth clan is settled in northwestern Tirannwn in a settlement known as the Elf Camp.
- Iorwerth is a common Welsh surname.
- The capturing of Prifddinas by the Iorwerth Clan could be a reference to the capturing and unification of Wales, particularly Gwynedd, in the early 13th century. This conquest by Llywelyn ab Iorwerth, also known as Llywelyn Fawr.