A son of Thomas Langstrother of Crosswaite, he was by 1453 a councillor of the Yorkist king Edward IV. He was an administrator of the hospital of St John of Jerusalem in England and was unanimously chosen as prior on 9 March 1469. The prior was normally the premier baron of England. Following the defeat of Edward's supporters by Warwick in 1469 at the Battle of Edgecote Moor he was appointed treasurer of England, but was dismissed by Edward later in the year. He was reinstated in 1470 after the temporary re-accession of Henry VI.
After the Yorkist win at the Battle of Tewkesbury in 1471, where he had shared command of the Lancastrian centre, he sought sanctuary in Tewkesbury Abbey but was taken out and executed in Tewkesbury town centre.  He was buried in the hospital of St John at Clerkenwell.
- Helen J. Nicholson [books.google.co.uk The Knights Hospitaller]. Boydell & Brewer, 2001 ISBN 0-85115-845-5. Retrieved 2011-12-16.
- R. A. Griffiths oxforddnb.com 16:25 first published 2004; online edn, Jan 2008, 487 words [Retrieved 2011-12-16]
- William Page (editor) (1908). "Houses of Knights Hospitaller: Preceptory of Balsall and Grafton". A History of the County of Warwick: Volume 2. Institute of Historical Research. Retrieved 16 December 2011.
- John A. Wagner books.google.co.uk Encyclopedia of the Wars of the Roses (367 pages) ABC-CLIO, 1 Jul 2001 ISBN 1-85109-358-3 [Retrieved 2011-12-16]
- Gregory O'Malley books.google.co.uk The Knights Hospitaller of the English langue, 1460-1565 (427 pages) Oxford University Press, 2005 ISBN 0-19-925379-X [Retrieved 2011-12-16]
- Griffiths, R.A. "Langstrother [Longstrother], Sir John (d. 1471)". Oxford Dictionary of National Biography (online ed.). Oxford University Press. doi:10.1093/ref:odnb/16996. (Subscription or UK public library membership required.)
Bedford, William Kirkpatrick Riland, 1826-1905; Holbeche, Richard, b.1850 archive.org The Order of the Hospital of St. John of Jerusalem; being a history of the English Hospitallers of St. John, their rise and progress (1902) London F.E. Robinson and co
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