'Chief' in the Bible

Rehum the chief deputy and Shimshai the scribe wrote a letter to King Artaxerxes concerning Jerusalem as follows:

From Rehum the chief deputy, Shimshai the scribe, and the rest of their colleagues—the judges and magistrates from Tripolis, Persia, Erech, Babylon, Susa (that is, the people of Elam),

The king sent a reply to his chief deputy Rehum, Shimshai the scribe, and the rest of their colleagues living in Samaria and elsewhere in the region west of the Euphrates River:Greetings.

Abishua’s son, Phinehas’s son,Eleazar’s son, Aaron the chief priest’s son