Brooke set himself up as a freelance adventurer and the Sultan's uncle immediately asked him to help put down the rebellion. Brooke readily agreed. The spears and muskets of the rebels were no match for a modern warship and the conflict soon ended. As a reward, the grateful Sultan made Brooke the Rajah of Sarawak in 1841. Brooke was not content to rule over a small riverside town, and set out to pacify his new kingdom, with the help of the British Navy. At the time of his death in 1868, Sarawak was a relatively peaceful territory covering the area between Tanjung Datu (which is now the Indonesian border) and Kuching.

James Brooke's nephew Charles, who succeeded him, was no adventurer like his uncle, but an excellent administrator and politician. He set up a proper system of government, gradually expanding his area of control until it formed the present day Sarawak. His legacy is everywhere in Kuching. It was he who built the Astana, Fort Margherita, the Courthouse, the Sarawak Museum and many other fine buildings. Charles Brooke died in 1917, and was succeeded by his son, Charles Vyner Brooke, who built on his father's achievements and improved the general administration of the state. In 1941 he set up a State Council to oversee the passing of new laws, bringing the first stirrings of democracy to Sarawak. The rule of the State Council was short-lived, as the Japanese invaded at the end of the same year. When the Japanese surrendered in September 1945, Sarawak came under Australian military administration. Vyner Brooke felt the state would be better off as a colony and ceded it to Britain. This move was very unpopular r and resulted in the assassination of the Governor, Duncan Stewart, in 1949. Order was eventually restored and the colonial administration concentrated on preparing Sarawak for independence. In 1963, Sarawak and Sabah gained independence by joining with Malaya to form the new nation of Malaysia.