Sir John St John, 1st Baronet
Sir John St John, 1st Baronet (5 November 1585–1648) of Lydiard Tregoze in the English county of Wiltshire, was a Member of Parliament and prominent Royalist during the English Civil War. He was created a Baronet on 22 May 1611.
John St John was the only surviving son of Sir John St John (c.1552–1594), and succeeded to the estates of Lydiard Tregoze (with a residency at Lydiard Park)  in Wiltshire and Purley Park in Berkshire upon his father's death. He matriculated at Trinity College, Oxford on 3 April 1601 and was admitted to Lincoln's Inn in 1604. He was knighted at Whitehall, on 2 February 1608, and was created a Baronet at the first institution of that order, on 22 May 1611, being the seventeenth in precedency by creation. In the early 1630s he inherited from Lord Grandison, his uncle, his estates at Battersea and Wandsworth.
During the English Civil War, St John and his family supported the Royalist cause. Three of his sons were slain in the service of King Charles I: William, his second son, was killed at the taking of Cirencester, in Gloucestershire, under Prince Rupert; Edward, the third son, at the Battle of Newbury, in Berkshire; and John, the fifth son, in the north.
Only two of his eight sons survived him, and it was his sixth son, Walter, who became his heir. His sixth son was not his immediate heir - the 2nd Baronet was his Grandson John St John - the only child of his 1st son Oliver St John and Catherine De Vere. Only when he died in 1657 did the title come back up the line to make Walter the 3rd Baronet. Sir Walter went on to found the Sir Walter St John School at Battersea.
He was the third child and eldest son of Sir John St John (1560–1594) and of Lucy Hungerford (1560–1627), daughter of Sir Walter Hungerford (Knight of Farley) and a granddaughter of the attainted and executed Walter Hungerford, 1st Baron Hungerford of Heytesbury.
He married twice, first to Anne Leighton (died July 1628 in childbirth), a daughter of Sir Thomas Leighton of Feckenham in Worcestershire, Governor of Jersey and Guernsey, and Elizabeth Knollys, and secondly Margaret Whitmore, the widow of Sir Richard Grubham. With his first wife, he had thirteen children.
His children were:
- Oliver St John (1612/1613 – November 1641 or 1642) married Catherine Vere, daughter of Horace Vere, 1st Baron Vere of Tilbury and Mary Tracy, and had Sir John St John, 2nd Baronet in 1648 (died 1657)
- Anne St John, Countess of Rochester (5 November 1614 – 18 March 1696), married first Sir Francis Henry Lee, 2nd Baronet, of Ditchley, and second Henry Wilmot, 1st Earl of Rochester
- John St John (b. 24 March 1615) married Dorothy Ayloffe.
- William St John (b. 1616)
- Edward St John (26 February 1617 – died at the Second Battle of Newbury, 1645)
- Barbara St John (b. 1618)
- Nicholas St John (29 March 1620 – 18 April 1639)
- Lucy St John (b. 1621)
- Sir Walter St John, 3rd Baronet of Lydiard Tregoze and of Battersea (1622 – 3 July 1708) married in 1651 his second cousin Johanna St John, daughter of Oliver St John of Longthorpe
- Francis St John (1623–1624)
- Elizabeth St John (1624–1629)
- Thomas St John (1625 – (1630)
- Henry St John, of Tandragee (July 1628 – September 1679) married his second cousin Catherine St John, daughter of Oliver St John, of Longthorpe
- Burke, Bernard (1866). A genealogical history of the dormant, abeyant, forfeited, and extinct peerages of the British empire. London: Harrison. p. 292.
- Cokayne, George Edward, ed. (1900). Complete Baronetage 1611–1625. 1. Exeter: William Pollard and Co. pp. 24,25.
- Lundy, Darryl (17 October 2006). "#i30697: Sir John St. John". thepeerage.com. Retrieved 17 October 2010. This source cites:
- Mosley, Charles, ed. (2003). Burke's Peerage, Baronetage & Knightage. 1 volumes (107th ed.). Wilmington, Delaware, U.S.A.: Burke's Peerage (Genealogical Books) Ltd. p. 416.
- This article incorporates text from a work in the public domain: Collins, Arthur; Brydges, Sir Egerton (1812). Peerage of England: genealogical, biographical, and historical. Greatly augmented and continued to the present time. 6. F.C. and J. Rivington [and others]. p. 53.