The Hassanzai is a sub-clan of Yousafzai, which is a Pakhtoon/Pashtoon/Pathan tribe. It is one of the divisions of the Isazai clan of the Yousafzai tribe. Yousafzai tribe is regarded as one of the most powerful, famous, and respected tribes of Pashtoons. Colonel H. C. Wylly (1858–1932) described the Hassanzai with the following sentence:
The Hasanzais are amongst The Black Mountain (Tor Ghar) Tribes; a division of the Isazai clan of the Yousafzai tribe. They are the descendants of Hassan the son of Isa (Isazai) and the grandson of Yusaf/Yousaf/(Yousafzai). The Hassanzais are further divided into following ten Sections:
The Hassanzais live on either side of the Indus; those cis-Indus occupy the most southern portion of the western slopes of Tor Ghar, while those trans-Indus live immediately opposite to them. The Hassanzai area is bounded on the north and east by the Akazais, on the west by the Indus,and on the south the Hassanzai border adjoins the territory of Tanawal, the former state of Amb.
Like all other Pashtoons, Hassanzais have maintained their cultural identity and individuality. They lead their lives strictly in accordance with code of ethics of Pashtoonwali which comprises Manliness, Goodness, Gallantery, Loyalty and Modesty. Hassanzais have also maintained the Pashtoon customs of Jirga (Consultative Assembly), Nanawati (Delegation pleading guilty), Hujhra (Large drawing room) and Melmasteya (Hospitality).
The Black Mountain (Tor Ghar) Tribes had never been under the British Rule. Hassanzais along with Akazais had been actively involved in fighting with British for quite some time. Brief account of the British Expeditions against The Black Mountain (Tor Ghar) Tribes is as under:-