'Second in command' in the Bible

Zikri, an Ephraimite warrior, killed the king's son Maaseiah, Azrikam, the supervisor of the palace, and Elkanah, the king's second-in-command.

They faithfully brought in the gifts, tithes, and consecrated materials, and Conaniah the descendant of Levi was placed in charge of them. His brother Shimei was second in command,