Ralegh’s family had been settled at Fardel in Devon since the mid-fifteenth century, and as a result of astute marriages had become connected with numerous powerful gentry in Dorset and Devon.
Soon after 1580 Ralegh married Dorothy, the widow of Sir John Thynne, in whose household he had recently served. The couple initially lived at her dower house in Corsley, Wiltshire,
In the first Jacobean Parliament Ralegh was a teller against recommitting a bill touching the dyeing of logwood (1 June 1610), and was included among the delegations ordered to deliver two grievance petitions to the king (14 May 1606 and 4 July 1610).
At the 1614 election Ralegh made way for his son Gilbert at Downton, but in 1621 he was once again returned for the borough. He was named to the standing committees for privileges (5 Feb.) and courts of justice (added 22 Feb.) and a committee for a bill concerning the licensing of beggars (22 November).
Surviving assessments of Ralegh are uncomplimentary. In 1606 he was reprimanded by the Privy Council for being publicly disrespectful to Viscount Bindon (Thomas Howard†).
Ralegh died intestate in 1627 and was buried at Downton.
