Excerpts from Books and Wikipedia
"The Abbasid general Abdullah ibn-Ali invited eighty members of the Umayyad family to a banquet at abu-Futrus near Jaffa on June 25, 750, and during the course of the feast had them all slaughtered." The new Abbasid dynasty would do more to spread Islam and less to advance Arab interests. Abd ar-Rahman, a member of the Umayyad family, escaped to Spain, where he founded a new empire. [Furtado: 1001 Days]