Durangaldea (also known by its Spanish name, Duranguesado) was during the Middle Ages a district apart from Biscay (the Señorío) and a dependency of Navarre, but was conquered by Castile in 1200. It remained separate from Biscay until 1630, and it held its own compilation of laws, with its regional council joining in Gerediaga, Abadiño. Its lords founded four chartered towns, namely Ermua, Elorrio, Durango, and Otxandio.
