Adalwin (Teut. noble friend) was an abbot of St. Haimeranus, and fourth (or, according to an ancient rhyme in Mabillon, Ann. ii, 160, the fifth) bishop of Ratisbon. This happened in 790, and two years after he' presided at a council which Charlemagne summoned for the condemnation of the Felician heresy. Hund argues the probability that the transfer of the cathedral from the Monastery of St. Haimeranus to the Church of St. Stephen, Ratisbon, was made under pressure from Charlemagne and against the judgment of Adalwin, who at his death, in 814, preferred to be laid among his predecessors in the old cathedral. See Metrop. Salisb. i, 188; Mabillon, Awn ii, 303.