Easton's Bible Dictionary (1897)
Best ruler, native of Thessalonica (Acts 20:4), a companion of Paul (Acts 19:29; 27:2). He was Paul’s “fellow-prisoner” at Rome (Col. 4:10; Philemon 1:24).
Smith's Bible Dictionary (1863)
(the best ruler), a Thessalonian, (Acts 20:4; 27:2) who accompanied St. Paul on his third missionary journey. (Acts 19:29) He was with the apostle on his return to Asia, (Acts 20:4) and again, Acts 27:2 On his voyage to Rome. We trace him afterwards as St. Paul’s fellow prisoner in (Colossians 4:10) and Phle 1:24 Tradition makes him bishop of Apamea.
Hastings' Dictionary of the Bible (1898) & Schaff's Bible Dictionary
ARISTAR'CHUS (best ruler), a Macedonian of Thessalonica who accompanied Paul upon his third missionary journey. Acts 20:4; Acts 27:2. He was nearly killed in the tumult which Demetrius excited in Ephesus, Acts 19:29, and it is said that he was finally beheaded in Rome. Paul alludes to him both as his fellow-laborer and fellow-prisoner. Col 4:10; Phile 24.
Hitchcock's Bible Names (1869)
the best prince