Albrecht D羹rer (21 May 1471 ??6 April 1528) was a German painter, printmaker and theorist from Nuremberg. His prints established his reputation across Europe when he was still in his twenties, and he has been conventionally regarded as the greatest artist of the Northern Renaissance ever since. D羹rer's introduction of classical motifs into Northern art, through his knowledge of Italian artists and German humanists, have secured his reputation as one of the most important figures of the Northern Renaissance. This is reinforced by his theoretical treatises, which involve principles of mathematics, perspective and ideal proportions.