Its last years were characterized by major feuds between the Qays and the K
Its last years were characterized by major feuds between the Qays and the Kalb and the evolution of a new sect known as the Hashimiyah.  Its later rulers of the Marwanid family finally saw their end with Marwan II, who was defeated at the Battle of the Great Zab River.  This dynasty's first ruling family was the Sufyanids, which was established by the son of Abu Sufyan, who emerged victorious over Ali, the fourth caliph.  Ruling from Damascus from AD 661 to 750, FTP, name this first great Muslim dynasty.
Its last years were characterized by major feuds between the Qays and the Kalb and the evolution of a new sect known as the Hashimiyah.  
Umayyad or Omayyad dynasty