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The name "Biledulgerid" is a version of "Beled el Gerid", the name of a place (Bled el Djerid) in modern Tunisia. In previous centuries it seems to have been used as the name of a region, roughly the area south of the Atlas Mountains, north of the Equator, west of Libya, east of the Atlantic coast. It seems to have become widely known in Europe after the publication in the mid 1500's of two descriptions of Africa: that of Leo Africanus in his 1550-ish Descrizione dell' Africa and that of Luis del MΓ‘rmol Carvajal, the 1573 descripcion general de Affrica. Samuel Purchas used these sources in his 1614 English-language work Purchas His Pilgrimage.
In 1550 the term "Africa" meant either the Roman province of Africa ("old Africa"), or the whole continent of Africa. According to MΓ‘rmol, in his discussion of the part of Africa that was, in effect known to the Romans, was divided into 6 regions: Berberia (the Barbary Coast or northern Maghreb), Beled el Gerid ("called by the ancients Gethulia or Numidia" or the southern Maghreb), Zahara (the Western Sahara), Lower Ethiopia (Nubia), Upper Ethiopia (Ethiopia proper), and Egypt. Numidia was the Latin name of what is now Tunisia, and "Gethulia" probably refers to the Gaetuli, a Berber tribe living near the Atlas Mountais.