Final answer:
Jassa Singh Ramgharia was a celebrated Sikh warrior and leader from the 18th century who established the Ramgharia Misl in the Sikh Empire. Detailed information on his three brothers and associates is not widely documented. His legacy includes significant contributions to Sikh military history and architecture.
Step-by-step explanation:
The question 'Who were Jassa Singh Ramgharia, his 3 brothers, and some associates?' is related to Sikh history. Jassa Singh Ramgharia was a prominent Sikh warrior and leader during the 18th century. Unfortunately, the historical records detailing the names and biographies of his three brothers and associates are not widely known, making it a challenge to provide accurate information on them.
Jassa Singh Ramgharia's contributions to Sikh history are significant, and he is best known for establishing the Ramgharia Misl, which was one of the confederacies of the Sikh Empire during that time. His legacy is marked by his leadership and his part in resisting external invasions and internal conflicts, as well as being a patron of architecture, evident from the fortifications built during his time.