The people of Western Sahara speak the Ḥassānīya dialect of Arabic, also spoken in northern Mauritania, and Spanish. They are of mixed Arab-Berber descent, but many consider themselves Arab. They claim that they descend from the Beni Hassan, an Arab tribe, who invaded the Western Sharan desert in the 14th century. The Sahrawis are Muslims of the Sunni sect and the Maliki law school. Their interpretation of Islam has traditionally being quite liberal and adapted to nomad life (i.e. generally functioning without mosques).