The Ghassanids were a group of Arab tribes that settled in the region of modern-day Jordan and Syria during the early centuries of the Common Era. They were known for their role as a buffer state between the Byzantine Empire and the Persian Empire. The Ghassanids were Christian and played a significant role in the spread of Christianity in the Arabian Peninsula. As a prominent tribal confederation, the Ghassanids were often involved in military alliances and conflicts. They served as allies to the Byzantines, helping to protect their eastern borders. Their influence declined after the rise of Islam in the 7th century, leading to their eventual assimilation into the emerging Islamic society.