He was the second son and heir of
John Rashleigh (1554–1624), MP for Fowey in 1588. He married twice. His first marriage was on 17 December 1614, to Anne Basset (c. 1595 – 1631), eldest daughter of Sir
Robert Basset (1573–1641) of
Umberleigh and
Heanton Punchardon in Devon, MP for
Plymouth in 1593, by his wife Elizabeth Periam (1571–1635), the second daughter and co-heiress of Sir
William Peryam,
Lord Chief Baron of the Exchequer. By Anne he had five children including: • John Rashleigh (1621–1651), who pre-deceased his father, whose mural monument exists in
Kenton Church. Devon. He married Joan Pollexfen (died 1668), daughter of John Pollexfen of Mothecombe, Devon, and was the father of
Jonathan Rashleigh II (1642–1702), of Menabilly, many times MP for Fowey and
Sheriff of Cornwall in 1687 • Alice Rashleigh, wife of Sir
Peter Courtney (c.1616 – 1670), MP, of Trethurfe, Cornwall. • Elizabeth Rashleigh, who married her cousin from the senior Cornwall line,
John Rashleigh (1619–1693) of Coombe, Fowey, MP for Fowey in 1661 His second marriage was in 1633 to Mary Harris (died 1674), daughter of John Harris of Radford, near Plymouth, Devon. Rashleigh died on 1 May 1675 and was succeeded by his grandson Jonathan Rashleigh (1642–1702), of Menabilly, many times MP for Fowey and
Sheriff of Cornwall in 1687. ==Career==