Northern European Cog Merchant Ship

Timeline

1. 1000–1100Danish and Schleswig coasts · DenmarkAlong the Northern European coasts, broad-beamed, flat-bottomed, single-masted square-sail commercial vessels gradually took shape, suited to shallow bays and estuaries, establishing the hull form for the later standardized cog.
2. 1201–1350Lübeck · LübeckFrom the 13th century, the cog became the principal vessel for transporting grain, furs, salt, and cloth between Hanseatic cities; ports such as Lübeck and Hamburg relied on it for North Sea and Baltic routes.
3. 1350–1450North Sea and the Skagerrak · North SeaCogs were raised in freeboard, given sterncastles and defensive fittings, and some took part in naval conflicts of the Hanseatic League and the Danish crown, making their dual merchant-war role more pronounced.
4. 1450–1500Dutch and Low Country ports · NetherlandsAs larger, multi-masted vessels like the hulk and carrack rose, the cog gradually yielded in oceanic and bulk trade, retreating mainly to coastal and short inland–coastal transport.