Rapidly maturing in his art, Donatello soon began to develop a style all his own, with figures much more dramatic and emotional. Between 1411 and 1413, he sculpted the marble figure St. Mark, placed in an exterior niche of the Orsanmichele Church, which also served as the chapel of Florence’s powerful craft and trade guilds. In 1415, Donatello completed the marble statue of a seated St. John the Evangelist for the cathedral in Florence. Both works show a decisive move away from the Gothic style and toward a more classical technique.