During the pre-Islamic period, the Umayyads or "Banu Umayya" were a leading clan of the Quraysh tribe of Mecca. By the end of the 6th century, the Umayyads dominated the Quraysh's increasingly prosperous trade networks with Syria and developed economic and military alliances with the nomadic Arab tribes that controlled the northern and central Arabian desert expanses, affording the clan a degree of political power in the region. The Umayyads under the leadership of Abu Sufyan ibn Harb were the principal leaders of Meccan opposition to the Islamic prophet Muhammad, but after the latter captured Mecca in 630, Abu Sufyan and the Quraysh embraced Islam. To reconcile his influential Qurayshite tribesmen, Muhammad gave his former opponents, including Abu Sufyan, a stake in the new order. Abu Sufyan and the Umayyads relocated to Medina, Islam's political centre, to maintain their new-found political influence in the nascent Muslim community.