Tirahi are a people who were the original inhabitants of Swat and Kohat

Kohat

Kohat is a medium sized town in Khyber Pakhtunkhwa province of Pakistan. It is located at 33°35'13N 71°26'29E with an altitude of 489 metres and is the capital of Kohat District. The town centres around a British-era fort, various bazaars, and a military cantonment. A British-built narrow gauge...

, North West Frontier Province, Pakistan

Pakistan

Pakistan , officially the Islamic Republic of Pakistan is a sovereign state in South Asia. It has a coastline along the Arabian Sea and the Gulf of Oman in the south and is bordered by Afghanistan and Iran in the west, India in the east and China in the far northeast. In the north, Tajikistan...

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History

According to Denzil Ibbetson

Denzil Ibbetson

Sir Denzil Charles Jelf Ibbetson KCSI was an administrator in British India and an author. He served as governor of the Central Provinces and Berar from 1900 to 1902....

's census report of 1892, "the Orakzai

Orakzai

Orakzai is a Pashtun tribe settled in the Orakzai Agency of Pakistan. It consists of eighteen clans. Most of the members are situated in the North West Frontier Province of Pakistan.-Location:...

 have several foreign sections Eg the Sheikhan

Sheikhan

Sheikhan City is situated in District Chiniot in Punjab province of Pakistan.-Southern side:The village Sheikhan is situated in some distance about 2.5 km from the right bank of river Chenab in Utar region which flows in south east of village...

 (No 10 in the appendix below )and several aboriginal or Tirahi sections..."

According to various historians including Fida Yunas and Ibbetson the Tirahi were originally Hindu

Hindu

Hindu refers to an identity associated with the philosophical, religious and cultural systems that are indigenous to the Indian subcontinent. As used in the Constitution of India, the word "Hindu" is also attributed to all persons professing any Indian religion...

 and were converted by Ghori :

"The Orakzai

Orakzai

Orakzai is a Pashtun tribe settled in the Orakzai Agency of Pakistan. It consists of eighteen clans. Most of the members are situated in the North West Frontier Province of Pakistan.-Location:...

 is a tribe of obscure origin, and it is doubtful if they are true Afghans, though they are said to belong to the Karlanrai race, being descended from Khadi the younger son of Karran, as are the Dilazak

Dilazak

The Dilazak are a Pashtun tribe of the Afghan Karlani branch, found in Pakistan and India.-History:The Dilazak descended from the Suleman Range into the valley of Peshawar during the time of the Samanid Dynasty, between 750 and 850 CE. They expelled or subdued local people of the Swati, Degan and...

 . The tribe itself claims descent from a Persian prince, Sikandar Shah who was exiled (wrukzai, lost or exiled) from his father's kingdom, and took refuge with the Muhammadan King of Kohat by whom he was employed to subdue the Tirahis of Tirah

Tirah

Tirah is a region located in Kurram and Khyber agencies of the Federally Administered Tribal Areas of Pakistan . It lies between the Khyber Pass and the Khanki Valley. It is inhabited by the Afridi and Orakzai tribes of Pashtuns...

, who were then Hindus or non Afghan s ruled by various rajas and divided into two branches -Dilazak and Parbali. Sikandar Shah conquered the Tirahis , and on the death of the Kohat king claimed that region as his son-in-law..."