Jonathan I Rashleigh (4 July 1591 – 1 May 1675), of Menabilly, near Fowey in Cornwall, was an English shipping-merchant, Member of Parliament for Fowey in 1614, 1621, 1625,[2] April 1640 and November 1640, [3] and 1661[4] and served as Sheriff of Cornwall in 1627.
His first marriage was on 17 December 1614, to Anne Basset (c. 1595 – 1631), eldest daughter of Sir Robert Basset (1573–1641)[5] 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.
}[3] He supported the King in the Civil War and was disabled from sitting in parliament in 1644.
He was bankrupted by penalties imposed on his estate and imprisoned in St Mawes castle.
He was elected once more MP for Fowey to the Cavalier Parliament in 1661 and sat until his death at the age of 83.