John Smith (
1790-
1824) was a 
missionary whose experiences in the 
West Indies attracted the attention of the anti-slavery campaigner, 
William Wilberforce.  While in 
Demerara[?], he had been asked to assist the governor in putting down a slave rebellion, but refused to do so.  For this, he was sentenced to death.  Wilberforce stepped in  to arrange a reprieve, but, by the time it arrived, Smith had already perished as a result of the awful conditions in jail.  His death was a major step forward in the campaign to abolish slavery.