Smith's Bible Dictionary

Demas

(governor of the people), most probably a contraction from Demetrius or perhaps from Demarchus, a companion of St. Paul, (Philemon 1:24; Colossians 4:14) during his first imprisonment at Rome. (A.D. 57.) At a later period, (2 Timothy 4:10) we find him mentioned as having deserted the apostle through love of this present world, and gone to Thessalonica.