Joseph Ketley, who worked towards the abolition of slavery and promoted Christian teaching amongst the African population and the native Indian tribes of the Essequibo River in the 1830s and 1840s, attended the Anti-Slavery Convention, organized by Anti-Slavery International (the world's oldest international human rights organisation), in London on 12 July 1840.
In the 1830s and 1840s Joseph Ketley worked towards the abolition of slavery and promoted Christian teaching amongst the African population and the native Indian tribes of the Essequibo River. On 12 July 1840 he attended the Anti-Slavery Convention in London. It is the world's oldest international human rights organisation, and works exclusively against slavery and related abuses. Along with the founding committee, which included the Anglican Thomas Fowell Buxton, the Quaker William Allen, and the Congregationalist Josiah Conder, they organised the first World Anti-Slavery Convention in London in 1840, that attracted delegates from around the world (including from the United States of America, in the South of which slavery was at times referred to as "our peculiar institution") to the Freemasons' Hall, London on 12 June 1840. 
