Proto and pre history:- Cave paintings at Lakhu Udyar and Gorkhyali Udyar; also some stone age tools; megaliths also found. Same as in other parts of country.
Epic era:- Mahabharat mentions Subahu, King of Kunindas from this area. Pandavas passed from here while going to Himalayas.
Earliest inscription:- At Kalsi(Dehradun) by King Ashoka. Shows it was an important area.
Sources of history:- Puranas give lists f Kings of various dynasties. Also coins provide names of Kings. Kumoan called Manas Khand and Garhwal as Kedar Khand. Both called Brahmpur together.
Post Kunindas:- Shakas etc. ruled in plains but Kunindas persisted in hills. Later Katyuri Kings ruled for significant time and built most of temples.
Katyuris:- Starting with Basantandeva, 3 dynasties. Ruled till 11th century. After them Panwars in Garhwal and Chandas in Kumoan. Katyuris later split into many branches and ruled under Chandas. Their capital was at Kartikeyapur and later at Baijnath.
Chandas:- Followed Katyuris in Kumaon. Originally came from Allahabad. Initially ruled in Champawat area but later shifted capital to Almora. Major Kings:- Gyan Chand, baj Bahadur Chand, Udyot Chand, Lakshmi Chand etc. Supplanted by Shah Kings of Garhwal during 18th century and later by Gorkhas in 1790.
Panwar Dynasty:- Ruled Garhwal starting with Kanakpal. Took title of Shah. Defeated Qarachil expedition of Tughlaq. Rani Karnawati. Supplanted by Gorkhas in 1805. Got back a shrunken kingdom from British and since then called Kings of Tehri.
Gorkhas- Ruled Kumaon for 25 years and Garhwal for 10 years. Defeated by British and by treaty of Sugauli gave the area of Uttarakhand to British.
British:-Since 1815, ruled by Commissioners such as Trail, Ramsey etc. 1857 revolt:-Kalu Mahra only revolutionary; Kumoan Parishad, Kuli Begar(Non Cooperation Movement), Chandra Singh Garhwali, Sridev Suman. Contribution of Uk in National Movement, INA etc.
Art and Architecture:- Paintings of Molaram, Pahari School of Architecture, Raghunath Temple
This is just a list of most important topics in very brief