|Easton's Bible Dictionary|
One who has judicial authority, literally, a "lord of judgement;" a title given to the Persian governor of Samaria (Ezra 4:8, 9, 17).
Noah Webster's Dictionary
(n.) A judicial court of chancery, which in England and in the United States is distinctively a court with equity jurisdiction.
Int. Standard Bible Encyclopedia
chan'-sel-er: The rendering in Ezra 4:8, 9, 17 of the Hebrew be`el Te`em; Septuagint Baal (4:9), Balgam (4:17), the latter being an incorrect translation of Hebrew `ayin. In 1 Esdras 2:16, 25, Beeltethmos (compare Ezra 4:8) occurs as a corruption, doubtless of be`el Te`em. The term in question designates an Assyrian office, namely, that of the "master or lord of official intelligence," or "postmaster" (Sayce).
Chancellor (3 Occurrences)
Ezra 4:8 Rehum the chancellor and Shimshai the scribe wrote a letter against Jerusalem to Artaxerxes the king in this sort: (WEB KJV ASV DBY WBS)
Ezra 4:9 then wrote Rehum the chancellor, and Shimshai the scribe, and the rest of their companions, the Dinaites, and the Apharsathchites, the Tarpelites, the Apharsites, the Archevites, the Babylonians, the Shushanchites, the Dehaites, the Elamites, (WEB KJV ASV DBY WBS)
Ezra 4:17 Then sent the king an answer to Rehum the chancellor, and to Shimshai the scribe, and to the rest of their companions who dwell in Samaria, and in the rest of the country beyond the River: Peace, and so forth. (WEB KJV ASV DBY WBS)