A Persian loanword meaning 'protector of the kingdom' -- the title for Persian provincial governors. Appears in Esther, Ezra, and Daniel describing officials ruling vast territories of the Persian empire.
God's servants -- Esther, Daniel, Mordecai -- operated faithfully within the satrap system of the world's greatest empire, demonstrating that no political structure is too powerful for God to work within. 'There is no authority except from God' (Romans 13:1). 'King of kings and Lord of lords' (Revelation 19:16).