Background
Unlike his father and his sons Montgomery never appeared to have served in the British Army. He was born in 1700 to Colonel Alexander Montgomery Member of Parliament for County Monaghan, of Ballyleck, County Monaghan, and Elizabeth Cole, (married 1696), daughter of Colonel Thomas Cole of Mount Florence, Florencecourt, County Fermanagh.
Career
Political
Their children were:
American Revolutionary War hero and former British Army officer Major General Richard Montgomery
Colonel Alexander Montgomery, Member of Parliament for County Donegal in 1768 and British Army officer
John Montgomery (1728–1787), a merchant in Lisbon, Portugal
Sarah Montgomery, who became Lady Ranelagh after marrying Charles Wilkinson Jones, the 4th Viscount Ranelagh. There is an agreement in the Erne papers (held in the Northern Ireland Public Records Office) dated 1727 between Alexander Montgomery and General David Creighton about the sharing of Lifford Corporation and its representation in the Irish House of Commons, to which it sent two MPs. One of the articles of agreement was that, if Montgomery should die without a son, then his interest should pass to the Creightons.
General David Creighton died in 1728 so the Lifford seat was filled by Thomas Montgomery, the nephew of Alexander.
On the death of Thomas Montgomery in 1761, full control of the Lifford seats passed to Abraham Creighton.
Membership
He was elected Member of Parliament (Member of Parliament) for Lifford, County Donegal in 1729 until his death in April 1761, at the age of 61.