"The genetic proximity observed between the Berbers and southern Europeans reveals that these groups shared a common ancestor. Two hypotheses are discussed: one would date these common origins in the Upper Paleolithic with the expansion of anatomically modern humans, from the Near East to both shores of the Mediterranean Sea; the other supports the Near Eastern origin, but would rather date it from the Neolithic, around 10,000 years ago (Ammerman & Cavalli-Sforza 1973; Barbujani et al. 1994; Myles et al. 2005; Rando et al. 1998). Common polymorphisms (i.e. those defining H and V lineages) between Berbers and south Europeans also could have been introduced or supported by genetic flows through the Straits of Gibraltar. For example, genetic exchanges could have taken place during prehistory, while European populations retreated from ice sheets and expanded from refuge, around 15,000 years ago (as evidenced by the H and U5b mitochondrial lineages). Alternatively, these exchanges could have occurred during history, with the invasion and the occupation during nearly seven centuries (from the 8th to the 15th century) of the Iberian Peninsula by Almoravide then Almohade Muslim Berber troops"