He was a member of a branch of the more prominent Rashleigh family of Menabilly, near Fowey.
Rashleigh was the only surviving son of Robert Rashleigh (1585 – c. 1667), MP, of Coombe, near Fowey, Cornwall, by his first wife Mary Trefusis, daughter of Thomas Trefusis of Landew.
[2][3] He matriculated at Brasenose College, Oxford in 1637 and entered Gray's Inn in 1639.
[4] He married in 1642 his cousin Elizabeth, the daughter of Jonathan Rashleigh of Menabilly, Cornwall and had 5 sons and 2 daughters
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