Ebbo or Ebo (c. 775 – 20 March 851) was the Archbishop of Rheims from 816 until 835 and again from 840 to 841. He was born a German serf on the royal demesne of Charlemagne. He was educated at his court and became the librarian and councillor of Louis the Pious, king of Aquitaine, son of Charlemagne. When Louis became emperor, he appointed Ebbo to the see of Rheims, then vacant after the death of Wulfaire. He was an important figure in the spread of Christianity in the north of Europe.
https://en.wikipedia.org/wiki/Ebbo