Hanmer was the son of Sir Thomas Hanmer, 2nd Baronet of Hanmer and his first wife Elizabeth Baker. In 1659, he was elected Member of Parliament for Flint in the Third Protectorate Parliament. He was knighted on 9 August 1660 and was High Sheriff of Gloucestershire from 1664 to 1665, In October 1669 he was elected MP for Evesham for the Cavalier Parliament. He succeeded to the Baronetcy on the death of his father in 1678. In 1681 he was elected MP for Flintshire . He was elected MP for Flint again in 1685. He became a colonel of the 11th Foot in 1688. In 1689 he was elected MP for Flint again. He became a major-general in the Army and was colonel of the 11th Foot, serving King William III at the Battle of the Boyne in 1690.
Hanmer married Mary Alston, daughter of Joseph Alston, of Netherhall, Suffolk. He died in 1701, probably killed in a duel and left no issue; he was succeeded in the baronetcy by his nephew Thomas, the son of his younger brother William who had already predeceased their father, the 2nd Baronet.
- John Hanmer (1st baron) (1876). A Memorial of the Parish and Family of Hanmer in Flintshire ... priv. Press at the Chiswick Press. p. 180.
- George E. Cokayne Complete Baronetage, Vol. 1 (1900)
- Dodd, Arthur Herbert. Hanmer family. Dictionary of Welsh Biography, online edition. Retrieved 22 December 2015.
- Bunbury, Henry Edward, ed. (1838). The correspondence of Sir Thomas Hanmer ... with a memoir of his life, to which are added, other relicks of a gentleman's family. London: Edward Moxon. pp. 4–5.CS1 maint: ref=harv (link) [Bunbury was Thos. Hanmer's brother-in-law.]
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