After the clans of the elves had begun to branch out across the mountain range of Arandar and into what is now known as Kandarin, an event known as the Break Out, in the early Fourth Age. The elven king Baxtorian and his forces settled at the foot of the Baxtorian Falls, which are now named after him, and established an elven-led kingdom. The Iorwerth stayed behind, entrusted with guarding the elven capital city of Prifddinas from within. This left the elven city virtually undefended and allowed Clan Iorwerth to attack and take capture of the city.