Ralegh was born in about 1583, possibly at Corsley in north Wiltshire.
During the 1610s Ralegh probably spent much time on official business in Weymouth and Portland, Dorset. At his mother’s death in 1616 he inherited a life interest in a number of copyhold tenements in Corsley, but his cousin Sir Thomas Thynne* claimed a right to these when he took possession of the manor itself. Ralegh subsequently sued for restitution, but the dispute remained unresolved in 1622.
Ralegh was sworn a gentleman of the privy chamber in August 1628, but died, intestate, on about 7 Jan. 1629; he was buried at Downton on 20 Jan. following.
