The Royal Scots Navy (or Old Scots Navy) was the navy of the Kingdom of Scotland from its origins in the Middle Ages until its merger with the Kingdom of England's Royal Navy per the Acts of Union 1707. There are mentions in Medieval records of fleets commanded by Scottish kings in the twelfth and thirteenth centuries. King Robert I (1274–1329, r. 1306–1329) developed naval power to counter the English in the Wars of Independence (1296–1328). The build-up of naval capacity continued after the establishment of Scottish independence. In the late fourteenth century, naval warfare with England was conducted largely by hired Scots, Flemish and French merchantmen and privateers. King James I (1394–1437, r. 1406–1437) took a greater interest in naval power, establishing a shipbuilding yard at Leith and probably creating the office of Lord High Admiral.
King James IV (1473–1513, r. 1488–1513) put the enterprise on a new footing, founding a harbour at Newhaven, near Edinburgh, and a dockyard at the Pools of Airth. He acquired a total of 38 ships including Great Michael, at that time, the largest ship in Europe. Scottish ships had some success against privateers, accompanied the king on his expeditions in the islands and intervened in conflicts in Scandinavia and the Baltic Sea, but were sold after the Flodden campaign. Thereafter Scottish naval efforts would rely on privateering captains and hired merchantmen. Despite truces between England and Scotland, there were periodic outbreaks of a guerre de course. James V built a new harbour at Burntisland in 1542. The chief use of naval power in his reign was a series of expeditions to the Isles and France.