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
Lanzarote to revoke Lanzarote's Biosphere Reserve status, "if the developments are not respecting local needs and are impacting on the environment". The President of the Cabildo of Lanzarote denied "any threat to Lanzarote's UNESCO status". The most established festival on the island is held each year on 15 September in the village of Mancha Blanca, in honour of Our Lady of Dolours ("Virgen de los Dolores"), also called the "Virgin of the Volcanoes" (the Patron Saint of Lanzarote). People from all over the island participate in this pilgrimage, mostly dressed in traditional costumes. Lanzarote Lanzarote (; ) is a Spanish island,