Abundius the fourth bishop of Como, who flourished from A.D. 450 to 469, was a native of Thessalonica. He was present at the Council of Constantinople in 450, and took an active part against the Eutychian heresy at the Council of Chalcedon, where he represented pope Leo. He was afterwards present at a Council of Milan (452) held to refute the same heresy. The authorship of the Te Deum is ascribed in some MSS. to him.