The Roebuck-class ship was a class of twenty 44-gun sailing two-decker warships of the Royal Navy. The class carried two complete decks of guns, a lower battery of 18-pounders and an upper battery of 9-pounders. This battery enabled the vessel to deliver a broadside of 285 pounds. Most were constructed for service during the American Revolutionary War but continued to serve thereafter. By 1793 five were still on the active list. Ten were hospital ships, troopships or storeships. As troopships or storeships they had the guns on their lower deck removed. Many of the vessels in the class survived to take part in the Napoleonic Wars. In all, maritime incidents claimed five ships in the class and war claimed three.

HMS Mediator was a Roebuck-class 44-gun fifth rate of the Royal Navy. She was built and served during the American War of Independence, but was reduced to a storeship and renamed HMS Camel in 1788. She spent the French Revolutionary and part of the Napoleonic Wars in this capacity before being broken up in 1810.