Is this the same person who was excommunicated by the Church and burned for his heresies? 
https://en.wikipedia.org/wiki/Girolamo_Savonarola
Wikipedia is not a good source.
Falsely accused and burned. Pope Alexander VI excommunicated him, yes, but then turned around and allowed him confession, communion and gave him a special indulgence before his execution. Which is odd given that he was "excommunicated".
Several Popes after his martyrdom, including St. Pius X and Pius XII, honored Savonarola greatly. St. Pius V declared his writings free of heresy, schism and other errors.