 From 1490 to 1492, Michelangelo attended the Humanist academy the Medici had founded along Neo-Platonic lines.There his work and outlook were influenced by many of the most prominent philosophers and writers of the day, including Marsilio Ficino, Pico della Mirandola and Poliziano.At this time, Michelangelo sculpted the reliefs "Madonna of the Steps" (1490–1492) and "Battle of the Centaurs" (1491–1492), the latter based on a theme suggested by Poliziano and commissioned by Lorenzo de Medici.