Albrecht Dürer was a famous German artist in the 15th-16th century. In 1514, he created an engraving called "Melancholy" that included his magic square, the first in Europe. Dürer's magic square has the unique property that the sum of each horizontal, vertical, and diagonal line of numbers in the 4x4 grid equals 34. This demonstrated Dürer's skill in mathematics and mysticism.