Canary Islands be many years before the island was fully conquered. The natives of La Gomera, and of Gran Canaria, Tenerife, and La Palma, resisted the Castilian invaders for almost a century. In 1448 Maciot de Béthencourt sold the lordship of Lanzarote to Portugal's Prince Henry the Navigator, an action that was accepted by neither the natives nor the Castilians. Despite Pope Nicholas V ruling that the Canary Islands were under Portuguese control, the crisis swelled to a revolt which lasted until 1459 with the final expulsion of the Portuguese. In 1479, Portugal and Castile signed the Treaty of Alcáçovas, which settled
Canary Islands third tallest volcano on Earth on a volcanic ocean island. All the islands except La Gomera have been active in the last million years; four of them (Lanzarote, Tenerife, La Palma and El Hierro) have historical records of eruptions since European discovery. The islands rise from Jurassic oceanic crust associated with the opening of the Atlantic. Underwater magmatism commenced during the Cretaceous, and reached the ocean's surface during the Miocene. The islands are considered as a distinct physiographic section of the Atlas Mountains province, which in turn is part of the larger African Alpine System division. In the summer of