Ali's son, Hosain, having married a daughter of one of the rulers of Persia before the time of Mahomet, the Aga Khan traced his descent from the royal house of Persia from the most remote, almost prehistoric, times.
Before the Aga Khan emigrated from Persia, he was appointed by the emperor Fateh Ali Shah to be governor-general of the extensive and important province of Kerman.
At that period the first Afghan War was at its height, and in crossing over from Persia through Afghanistan the Aga Khan found opportunities of rendering valuable services to the British army, and thus cast in his lot for ever with the British.
The Aga Khan reciprocated the British commander's confidence and friendship by giving repeated proofs of his devotion and attachment to the British government, and when he finally settled down in India, his position as the leader of the large Ismailiah section of Mahommedan British subjects was recognized by the government, and the title of His Highness was conferred on him, with a large pension.
He was succeeded by his eldest son, AGA Khan Ii.