Abbas the Great or Abbas I of Persia was the 5th Safavid Shah of Iran, and is generally considered one of the greatest rulers of Iranian history and the Safavid dynasty. He was the third son of Shah Mohammad Khodabanda.
Although Abbas would preside over the apex of Iran's military, political and economic power, he came to the throne during a troubled time for the Safavid Empire. Under his inefficient father, the country was riven with discord between the different factions of the Qizilbash army, who killed Abbas' mother and elder brother. Meanwhile, Iran's enemies, the Ottoman Empire and the Uzbeks, exploited this political chaos to seize territory for themselves. In 1588, one of the Qizilbash leaders, Murshid Qoli Khan, overthrew Shah Mohammed in a coup and placed the 16-year-old Abbas on the throne. However, Abbas soon seized power for himself.
Under his leadership, Iran developed the ghilman system where thousands of Circassian, Georgian, and Armenian slave-soldiers joined the civil administration and the military.