Historian Dr Ian Friel made the discovery while studying aerial photographs for a new book on English king Henry V.
Historic England, who are investigating Friel’s find, said Holigost was one of four great ships commissioned by the king for fighting the French.
The heritage group believes the ship played a key part in two of the most significant battles of the Hundred Years’ War, which ran from 1337 to 1453 and centred on tensions around the overseas possessions of English kings.
The ship, believed to have been found in the River Hamble near Southampton, took part in the Siege of Harfleur in 1416 and the Chef de Caux a year later.
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