The document outlines the reign of Sultan Hashim of Brunei from 1885 to 1906, detailing his struggles with British encroachment on Bruneian territories, particularly the seizure of Limbang by Charles Brooke. Despite Sultan Hashim's attempts to safeguard his kingdom through the 1888 Treaty of Protection, British interests led to further territorial losses, including Limabang. The supplemental agreement in 1905-1906 ultimately formalized British influence over Brunei’s affairs, marking a significant shift in the region's political landscape.