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.

Life Atto was born around 1070. Spanish historian Enrique Flórez thought Atto was from Badajoz in Extremadura, Spain close to the Portuguese border. A Portuguese source says he was born in Beja, Portugal.

He went as a pilgrim to Italy, and stopped at Vallombrosa Abbey where he was welcomed by the abbot, Bernardo degli Uberti. He became abbott-general around 1120. He wrote lives of John Gualbert and Bernard degli Uberti, bishop of Parma. This later gave rise to a chapel dedicated to St. James. This had both economic and political ramifications, as pilgrims soon began to come to Pistoia to honor the saint.