Admiral Sir William de Leybourne | |
|---|---|
| Born | 1242 Leybourne Castle, Leybourne, Kent, England |
| Died | 18 March 1310 Preston, near Wingham, Kent. |
| Allegiance |  England |
| Service/ |  Royal Navy |
| Years of service | 1265–1306 |
| Rank | Admiral |
| Commands | Admiral of the English Seas Admiral of the South Admiral of the West Admiral of the Irish Sea |
| Battles/wars | Battle off Bruges Siege of Bayonne Siege of Caerlaverock Siege of Winchelsea |
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Admiral Sir William de Leybourne[1] (French: Guillaume de Leybourne; Latin: Willelmus de Leyburnia or Leyburna; c. 1242–1310) was an English knight and military commander, sometimes reckoned the first admiral of the English navy.