The strictest sect of Scotch Presbyterians, organised in 1680, by Richard Cameron, who was slain in battle at Aird's Moss in 1680. He objected to the alliance of Church and State. In 1876 most of the Cameronians were merged in the Free Church. In history the Cameronians are generally called the Covenanters.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894