Zarrar Ibn al-Azwar

In 634, when Eastern Roman Empire met Rashidun Caliphate, among them was Zarrar Ibn al-Azwar, who was a tax-collector, but whenever war broke out he was charging the battlefield without armor earning him the nickname of “the half-naked warrior.” During this war, when the caliphate was on the verge of losing, they challenged the Byzantine officers with a series of duels against Azwar. He killed two governors and every other Roman champion, leaving the Roman army with no officers to lead. Caliphate won Syria and Palestine and ruled there for more than 1000 years.