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His full name was Muhammad ibn Harun ibn Muhammad ibn Abdullah ibn Muhammad ibn Ali ibn Abdullah ibn Abbas ibn Abd al-Muttalib, belonging to the Banu Abbas family. He was known as al-Amin and affectionately called Abu Abdullah. He was born in Baghdad in the year 1970 AH, a devout Muslim by faith. Raised in a life of luxury and comfort, he inherited power, prestige, and immense wealth. His father was the Caliph Harun al-Rashid, and his mother was Zubaida bint Jaafar. He had three brothers: Abdullah, al-Ma'mun, Muhammad al-Mu'tasim bi-Allah, and al-Qasim. Al-Amin was born in the same year his father ascended the caliphate—approximately six months after that event.
Al-Amin was handsome, with fair skin and a tall stature. He was cheerful, quick-witted, eloquent in speech, and possessed great courage and strength. It is widely reported that he once killed a lion with his bare hands.
On Thursday, December 8, 791 AH, Harun al-Rashid designated his second son, Muhammad al-Amin, as his successor and granted him authority over Syria and Iraq. The oath of allegiance was placed inside the Kaaba. By bypassing his eldest son, al-Ma'mun, this decision ignited deep tensions between al-Amin and al-Ma'mun, leading to growing conflict.
Caliph Muhammad al-Amin was renowned for his skill in chess. He often spent his free time playing on a chessboard, gathering the finest players at his court. So deeply engrossed would he become that he would lose track of time, completely absorbed in the game and focused on securing victory.
His reign was brief, lasting only about five years. He was generous and magnanimous. Among his key achievements during this period were:
Al-Amin broke the promises and agreements established by his father and brother. He named his son Musa as heir apparent, publicly proclaimed his name from the pulpits, and referred to him as "the one who speaks the truth." He deliberately omitted mention of his brothers al-Ma'mun and al-Mu'tasim. This move provoked opposition from the people of Khurasan, who rallied behind al-Ma'mun instead.
Initial attempts at peaceful negotiation between al-Amin and al-Ma'mun failed to yield results. After al-Amin formally appointed his son Musa as successor, al-Ma'mun decided to prepare for war. He assembled a powerful army under commanders such as Tahir ibn al-Hussein and Harsama ibn Amin. Meanwhile, al-Amin's forces were led by Ali ibn Isa ibn Mahan, who was ultimately defeated and killed by al-Ma'mun's troops. The war ended in al-Ma'mun's victory. Despite this, al-Amin refused to surrender, continuing to send armies into battle. These repeated defeats drained his resources and financial reserves.










