St John was a son of Oliver St John, 3rd Baron St John of Bletso and his wife Dorothy Reid, daughter of Sir John Rede or Reid, of Odington, Gloucestershire.
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St John was a son of Oliver St John, 3rd Baron St John of Bletso and his wife Dorothy Reid, daughter of Sir John Rede or Reid, of Odington, Gloucestershire.
He was greatly trusted by John Pym and Oliver St John, and is mentioned by Clarendon as among the “great contrivers and designers” in the House of Lords.
He retired to his country house in Northamptonshire till 1662, when he left England and went to Basel, Switzerland and afterwards to Augsburg, Germany.
St John was son and heir of Oliver St John, 3rd Baron St John of Bletso, by his wife Dorothy Reid, daughter and heiress of Sir John Rede or Reid, of Oddington, Gloucestershire.
Before 1591 he had attained the rank of captain, and in the autumn of that year commanded Essex's horse at the siege of Rouen.
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His mother was distantly related to Charles Blount, 8th Baron Mountjoy, and on his father's side he was descended through a female line from the Grandisons, and was related to the St Johns, Barons of Bletso.
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He was the second son of Nicholas St John (ca. 1526 – 8 November 1589) of Lydiard Park in Wiltshire and Purley Park in Berkshire, by his wife Elizabeth (bef. 1542 – 1587), daughter of Sir Richard Blount of Mapledurham House in Oxfordshire, and Elizabeth Lister.