Three major rebellions led by Rentap (1853), Liu Shan Bang (1857) and Syarif Masahor (1860) shook the Rajah's administration which, together with the stagnant economic conditions at the time, caused Brooke to be plagued by debt. He was driven into planning to cede Sarawak to the British to settle his debt; while the idea was supported by some of Britain's members of parliament (MPs) and businessmen, it was rejected by Prime Minister Lord Derby who feared that the introduction of a British taxation system would shock the population more than exercising their own system under the Rajahs. There were also concerns about its financial viability and probable drain on the exchequer. Brooke then thought to sell his kingdom to Belgium, France, Russia or to Brunei again or also to other European powers rather than to the neighbouring Dutch who were ready to retake Sarawak. Brooke's intention had already been decried by neighbouring British governors such as Labuan Governor Hennessy who, while respecting the Rajah, considered Sarawak a mere vassal state of Brunei.