Battle of Hunayn
After the Mecca conquest and the victory at the Battle of Hunayn, the supremacy of the Muslims was somewhat established throughout the Arabian peninsula. Various tribes started to send their representatives to express their loyalty to Muhammad. In the year 9 AH (630 CE), Zakat – which is the obligatory charity in Islam – was introduced and was accepted by most of the people. A few tribes initially refused to pay it, but gradually accepted.