These pyramid tombs have attracted the attention of some scholars, such as Mohamed Chafik who wrote a book discussing the history of several of the tombs that have survived into modern times. He tried to relate the pyramidal Berber tombs with the great Egyptian pyramids on the basis of the etymological and historical data. The best known Berber pyramids are the 19-meter pre-Roman Numidian pyramid of the Medracen and the 30-meter ancient Mauretanian pyramid. The Numidian pyramid in Tipaza is also known as Kbour-er-Roumia or "Tomb of Juba and Sypax", mistranslated by the French colonists as "Tomb of the Christian Woman". The Tomb holds the graves of King Juba II and Queen Cleopatra Selene II, sovereigns of Mauretania.