Willerich

Willerich (*unknown – 4 May? 838*) was the second bishop of Bremen in Germany; or, according to some, the first, his predecessor Willehad being just a missionary in the area, and the diocese set up after his death. He was consecrated in 804 or 805.

He took part in a mission to Denmark in 823, with Ebbo of Rheims and Halitgar, bishop of Cambrai. It had only a very limited success.

...
Wikipedia