Atto of Pistoia
Atto of Pistoia, or Saint Atto (c. 1070 – 22 May 1153), was a Catholic bishop and a professed member from the Vallumbrosan Order as well as the Bishop of Pistoia and a noted historiographer.
In the Martyrology
- May 22 Saint Atto, Vallombrosian abbot, bishop of Pistoia