He was the son of John Scory, the bishop of Hereford. His father's patronage made him a prebendary of Hereford, 1565–9. According to John Aubrey his father "loved him so dearly that he fleeced the Church of Hereford to leave him a good estate". Despite his background, Scory adopted a form of Catholicism; he had had contact with Catholics during education abroad.
Scory fought in the Low Countries, a follower of Robert Dudley, 1st Earl of Leicester. He was acquainted with the diplomats Michel de Castelnau, and through him Bernardino de Mendoza; at the time of the laying of the Francis Throckmorton plot Scory was on the fringe of the conspiracy, was examined, and had Castelnau write to Francis Walsingham on his behalf. It came out that Scory as intermediary had arranged for Leicester to meet Mendoza at a dinner held by Customer Smythe. In a similar role, he had set up a meeting of Gaston de Spinola, envoy from Alexander Farnese, Duke of Parma in Flanders, with the queen. Scory was at the same time suspected as the author of the scurrilous Leycester's Commonwealth. He did know something of its circulation, to Henry Noel.
His father's death in 1585 involved Scory in a chancery case with the new bishop of Hereford. In 1587 the privy council asked Edmund Colles and others to settle the dispute. The History of Parliament calls Scory a "swindler".
Scory was on good terms with Sir Philip Sidney; but Sidney broke off the relationship in July 1583. He was favoured by Francis, Duke of Anjou, Queen Elizabeth's suitor; and became a patron of Ben Jonson He was a friend of Walter Raleigh and Lawrence Kemys; and a client of Henry Percy, 9th Earl of Northumberland.
Scory was Member of Parliament for Newtown, Hampshire, Isle of Wight in 1597. His court connections were influential here, and are presumed to have given him favour with George Carey, 2nd Baron Hunsdon as nominator.
Scory went to Simon Forman to have impotence treated in 1598. In 1615 he had extensive self-interested discussions with the king on the privileges of baronets. Dying in 1617, he was buried in St. Leonard's, Shoreditch. He had two sons.
- Surname also Skory, forename Silvan or Sylvan.
- A. L. Rowse, Simon Forman: Sex and Society in Shakespeare's Age (1974), pp. 195–6.
- Aubrey's Brief Lives, ed. Oliver Lawson Dick, 1949
- John Bossy (1 August 2002). Giordano Bruno & the Embassy Affair. Yale University Press. p. 34. ISBN 978-0-300-09451-0. Retrieved 16 November 2012.
- M. Claire Cross (1996). Patronage and Recruitment in the Tudor and Early Stuart Church. Borthwick Publications. p. 83. ISBN 978-0-903857-66-6. Retrieved 15 November 2012.
- Dr. Simon Adams (2002). Leicester and the Court: Essays on Elizabethan Politics. Manchester University Press. p. 190. ISBN 978-0-7190-5325-2. Retrieved 15 November 2012.
- John Bossy, Under the Molehill: An Elizabethan Spy Story, Yale University Press (2001), p. 78 with note 47.
- historyofparliamentonline.org, Scory, Sylvanus (d.1617), of Cordwainer Street, London.
- historyofparliamentonline.org Smythe, Thomas I (1522-91), of London, Ashford and Westenhanger, Kent.
- John Bossy (1 August 2002). Giordano Bruno & the Embassy Affair. Yale University Press. p. 105. ISBN 978-0-300-09451-0. Retrieved 16 November 2012.
- John Bossy (1 August 2002). Giordano Bruno & the Embassy Affair. Yale University Press. p. 213 note 3. ISBN 978-0-300-09451-0. Retrieved 16 November 2012.
- John Bayley; Great Britain. Record Commission (1827). Calendars of the Proceedings in Chancery, in the Reign of Queen Elizabeth; to which are Prefixed Examples of Earlier Proceedings in that Court, Namely from the Reign of Richard the Second to that of Queen Elizabeth, Inclusive. G. Eyre and A. Strahan. p. 4. Retrieved 16 November 2012.
- historyofparliamentonline.org, Colles, Edmund (1528-1606), of Leigh, Worcs.
- historyofparliamentonline.org, 1558–1603, The Men.
- H. R. Woudhuysen (1996). Sir Philip Sidney and the Circulation of Manuscripts: 1558 - 1640. Oxford University Press. p. 338. ISBN 978-0-19-812966-0. Retrieved 15 November 2012.
- Roger Kuin (29 September 2012). The Correspondence of Sir Philip Sidney. Oxford University Press. p. 1333. ISBN 978-0-19-955822-3. Retrieved 15 November 2012.
- Paul Hyland, Ralegh's Last Journey, HarperCollins (2004), p. 9.
- Early Stuart Libels, Raleigh in this thy selfe thy selfe transcends.
- John Nichols (1828). The Progresses, Processions, and Magnificent Festivities, of King James the First: His Royal Consort, Family, and Court; Collected from Original Manuscripts, Scarce Pamphlets, Corporation Records, Parochial Registers, &c., &c. ... Illustrated with Notes, Historical, Topographical, Biographical and Bibliographical. J.B. Nichols. p. 92. Retrieved 15 November 2012.