Background
Agnew was born in Virginia, the son of the Reverend John Agnew, and was educated in Glasgow, and joined the Queen"s Loyal Virginia Regiment at the beginning of the American Revolution.
Agnew was born in Virginia, the son of the Reverend John Agnew, and was educated in Glasgow, and joined the Queen"s Loyal Virginia Regiment at the beginning of the American Revolution.
He represented York County in the Legislative Assembly of New Brunswick from 1792 to 1795 and from 1796 to 1821. Agnew and his father, a chaplain for the loyalists, were captured in 1781 and released at the end of the war. In 1789, Agnew settled in New Brunswick near Fredericton.
He served as a justice of the peace and a judge of the Inferior Court of Common Pleas for the county from 1799 until his death at his estate in York County in 1821.
Agnew, a slave owner, challenged Judge Isaac Allen to a duel after the judge found in favour of an escaped slave in a trial held in 1800. Allen refused the challenge.
Agnew later fought with Samuel Denny Street, one of the lawyers for the slave.