1911 Encyclopædia Britannica, Volume 28… (1911)
“ He showed great ability at an early age, and was made governor of Herat by his father, but broke into open rebellion against him in 1870, and was imprisoned in 1874 in Kabul. However, when Shere Ali in 1878 fled before the British, he handed over the government to Yakub, who, on his father's death in the following February, was proclaimed amir, and signed a treaty of peace with the British at Gandamak. He agreed to receive a British resident, and was in turn to receive a subsidy and support against foreign attack. ”
