Hatto I (archbishop of Mainz)
(重定向自Hatto I)
Hatto I (c. 850 – 15 May 913) was archbishop of Mainz (Mayence) from 891 until his death.
Hatto belonged to a Swabian family, and was probably educated at the monastery of Reichenau, of which be became abbot in 888. He was also abbot of Ellwangen Abbey.