In the Tuareg areas of Algeria, a distinct tenant-peasant strata lives around oases known as "izeggaren" (or "haratin" in Arabic). Traditionally, these local peasants were subservient to the warrior nobles who owned the oasis and the land. The peasants tilled these fields, whose output they gave to the nobles after keeping a fifth part of the produce. Their Tuareg patrons were usually responsible for supplying agricultural tools, seed and clothing. The peasants' origins are also unclear. One theory postulates that they are descendants of ancient people who lived in the Sahara before they were dominated by invading groups. Some speak a Songhay dialect along with Tuareg and Arabic. In contemporary times, these peasant strata have blended in with freed black slaves and farm arable lands together.