'Chancellor' in the Bible

Rehum the chancellor and Shimshai the scribe wrote a letter against Jerusalem to Artaxerxes the king in this sort:

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,

[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.