One of the most influential painters of northern Italy was Andrea Mantegna of Padua, who had the good fortune to be in his teen years at the time in which the great Florentine sculptor Donatello was working there. Donatello created the enormous equestrian bronze, the first since the Roman Empire, of the condotiero Gattemelata, still visible on its plinth in the square outside the Basilica of Sant'Antonio. He also worked on the high altar and created a series of bronze panels in which he achieved a remarkable illusion of depth, with perspective in the architectural settings and apparent roundness of the human form all in very shallow relief.