Arabs in Palestine, both Christian and Muslim, settled and Bedouin, were historically split between the Qays and Yaman factions. These divisions had their origins in pre-Islamic tribal feuds between Northern Arabians ("Qaysis") and Southern Arabians ("Yamanis"). The strife between the two tribal confederacies spread throughout the Arab world with their conquests, subsuming even uninvolved families so that the population of Palestine identified with one or the other. Their conflicts continued after the 8th century Civil war in Palestine until the early 20th century and gave rise to differences in customs, tradition, and dialect which remain to this day.