The Lannisters then lost to the Targaryens and were made Wardens.
Most of the information related to the Westerlands come from members of House Lannister and their bannermen due to their involvement in the War of the Five Kings, as well as accounts of Robb Stark's exploits in the region from secondhand sources additional information regarding the region is further discussed in The World of Ice and Fire. The Westerlands are the only region in Westeros that is not featured in any POV character chapter in ASOIAF, the Tales of Dunk & Egg, nor is featured in the Archmaester Gyldayn's Histories. Bastards in the Westerlands are given the surname 'Hill'. The region used to be ruled by the extinct House Casterly, which was deposed by Lann the Clever, who founded House Lannister. However, the coastline is flat and very vulnerable to assault, particularly by Ironborn raiders.
Bordered by the Riverlands to the northeast and the Reach to the southeast, numerous mountains and hills along the border give the Westerlands natural defensive barriers. Ruled by House Lannister from the stronghold of Casterly Rock overlooking the city of Lannisport, the Westerlands is the richest region of Westeros, being home to numerous gold and silver mines.
