Grace Dieu was built to a design proposed by William Soper, a burgess of Southampton and Clerk of the King's Ships. She was clinker-built with three planks nailed together along each part of her hull and waterproofed with tar and moss sandwiched between the timbers. As constructed she was long with a beam, comparable in size with HMS Victory and twice as large as Mary Rose. Estimates of her weight range between 1,400 tons and 2,750 tons. Two other ships, Valentine and Falcon were built to escort her. A dock was specially built for her construction near Town Quay in Southampton. The remains of Grace Dieu suggest that it was built in a hurry, with some of the planks and ribs left only roughly finished. She was a vast ship requiring 2735 oak, 1145 beech, and fourteen ash trees for her timbers. When completed in 1418, she was one of the largest wooden ships of its time. Humphrey, Duke of Gloucester regarded her as "the fairest that ever man saw," while the Florentine Captain of the Galleys, Luca di Masa degli Albizzi, remarked that despite his lifetime at sea he had never seen "so large and beautiful a construction." Grace Dieu was designed for use in battle against Genoas formidable fleet of carracks, that city being at the time the ally of France and enemy of England. To this end she was built with high sides and a prow that rose more than, so that her archers could fire from above into the much lower carracks that she would run alongside. However, by the time she was completed England had firm control over the Channel and was at peace with France following the Treaty of Troyes.
1420 voyage
Grace Dieu and her escorts appear to have only set sail once, in 1420, under the command of the Earl of Devon and with orders to make a cruise down the English Channel. The expedition suffered a mutiny even before leaving port, when the crew objected to the presence of a contingent of soldiers and archers brought aboard to guard the vessel. Grace Dieus sailors attempted to prevent the soldiers from boarding by abusing the clerk who was registering their names and threatening to throw the register itself into the sea. When the ship finally left port, nine of the crew incited a further mutiny against the captain by refusing to take their stations and insisting that the cruise be abandoned. Grace Dieu was brought into the nearest port, St. Helen's on the Isle of Wight, and the crew departed. A clerk who questioned their loyalty as they departed was assaulted and had his clothing torn.
Service after Henry V's death and loss
When Henry V died in 1422 his ships were treated as his private property rather than as part of the kingdom's navy. Many were sold off to pay his debts. In 1430 William Soper, by now in charge of the administration of the entire navy, dined with the commander of the Florentine merchant fleeton boardGrace Dieu. Subsequently, Grace Dieu was laid-up in the River Hamble. Already dismasted and stripped of equipment, she was burnt to the waterline after being set ablaze by a bolt of lightning in 1439.
Rediscovery
The remains of Grace Dieu are still in the River Hamble at Bursledon, near Southampton, Hampshire. Until 1933 the wreck was believed to be that of a Danish galley or a nineteenth-century merchant ship, but in that year a proper survey established both the true identity of the wreck, and the great size of the ship. The site was designated under the Protection of Wrecks Act on 5 February 1974 and was excavated by Channel 4's archaeology programme Time Team in 2004 for the 2005 series. 50 metres from the remains lie those of another vessel, believed to be Grace Dieu's contemporary Holigost.
