Master Bertram was a German International Gothic painter primarily of religious art. The most important picture attributed to him is the Grabow Altar (c.1379/83, Hamburg, Kunsthalle). He is first recorded in Hamburg in 1367, and lived there for the rest of his life, becoming a citizen and Master in 1376, and achieving considerable prosperity. In 1390 he made a will in advance of an intended pilgrimage to Rome, but if he made the journey it had no detectable influence on his art. He was married, but his wife had died by his second will in 1410, when he had a surviving daughter. His style is less emotional than that of his Hamburg near-contemporary Master Francke, but has great charm.