Who was Michelangelo's teacher?
Michelangelo and the Medici
It was then that Michelangelo first began writing down his deepest thoughts in poetry which he continued to do for the rest of his life.[4]
From 1490 to 1492, Michelangelo attended the Humanist academy which the Medici had founded.  He absorbed Renaissance Neoplatonism through his direct contact with some of the great Renaissance humanist philosophers of the Medici Court.[5]  Consequently, both Michelangelo's outlook and his art were subject to the influence of many of the most prominent philosophers and writers of the day including Marsilio Ficino, Pico della Mirandola and Angelo Poliziano.[6]  Michelangelo studied sculpture under Bertoldo di Giovanni. At this time Michelangelo sculpted the reliefs Madonna of the Steps (1490–1492) and Battle of the Centaurs (1491–1492). The latter was based on a subject suggested by Poliziano and was commissioned by Lorenzo de' Medici.[1]