The first inhabitants of Lahul and Spiti were a mixture of the proto-Tibetan Khampa and Indo-Aryan nomadic populations, who eventually intermarried and settled down.
Lahul and Spiti came under the influence of Tibet sometime during the 9th and 10th century. With the downfall of the Tibetan administration in Lhasa, Ladakh eventually took political control of Lahul and Spiti until the early 17th century.
The Pattan Valley, Chamba and Upper Lahul came under the control of Raja Biddhi Singh from Kullu in the years 1672 to 1688. Other Rajas conquered Lahul and Spiti in subsequent invasions. Although Spiti came under the control of Ladakh from the 18th century until 1846, the governor only held loose control over Spiti. It was therefore, in practice, controlled by the Wazir and Nono.
piti came under the rule of the Dorga in 1846, while Lahul came under the control of the British East India Company. This occurred with the help of an appointed Wazir, led by the Kolong family. This pattern continued until World War I, when it was subsequently abolished.
wing to their cultural and ethnic similarities and close proximity to each other, Lahul and Spiti were merged to form a single district in 1960, with headquarters re-established at Keylong.