Battle of Yarmouk
Like the Herodians before them, the Ghassanids ruled as clients of Rome - this time, the Christianised Eastern Roman Empire, or Byzantium; the Ghassanids were able to hold on to the Golan until the Sassanid invasion of 614. Following a brief restoration under the Emperor Heraclius, the Golan again fell, this time to the invading Arabs after the Battle of Yarmouk in 636.