The Greek noun dynastes refers to a ruler, potentate, or one invested with great power — used in the New Testament for earthly rulers and, supremely, for God Himself.
Dynastes reaches its theological peak in 1 Timothy 6:15, where Paul describes God as 'the blessed and only Sovereign, the King of kings and Lord of lords.' This doxology grounds all human power in divine authority. The Ethiopian eunuch (Acts 8:27) serves under an earthly dynastes — yet his soul is thirsty for the word of God. Human rulers hold their thrones on loan from the true Sovereign. The word calls all who exercise power to recognize that their authority is delegated, accountable, and temporary.