Jassa Singh Ramgarhia was a carpenter, a Tarkhan, and took his name from the Ramgarh fort at Amritsar, which he held and rebuilt. The misl's territory ran along the Beas and included Batala, Kalanaur, Sri Hargobindpur and Urmar Tanda.
He was driven out by a coalition of other misls in 1776 and spent years in the Cis-Sutlej country and beyond the Jamuna before returning and recovering his territory.
The Ramgarhia Bunga at Amritsar, beside the sarovar, is his, with its two towers. The tradition is that the slab in it is from the Delhi throne of the Mughals, brought back after the 1783 expedition.
The Ramgarhia name became a caste identity as much as a political one. Ramgarhia Sikhs, artisan castes by origin, formed the backbone of Punjabi emigration to East Africa as railway and public works artisans, and Ramgarhia gurdwaras in Britain descend directly from that migration.
A misl name from 1748 is now a surname in Southall and Nairobi, which is a longer afterlife than most of the misls got.
Its fighting strength was smaller than the Bhangis' or the Kanhaiyas' and its advantage was technical. It could build, repair and reduce forts, which in a country of mud forts decided more sieges than cavalry did.
Jodh Singh, his son, held the misl after him and was on good terms with the Lahore darbar, so the territory passed into the Sikh state by inheritance rather than by conquest when he died in 1816. The family kept jagirs and served the court afterward, which is not how most of the twelve ended.
The bunga is one of only two left standing out of some seventy, and its two towers are visible from anywhere on the parikrama. What is inside it, and who has examined any of it recently, is not a matter of public record.
Hari Ram Gupta on the misls.