The Book of Deuteronomy presents itself as Moses’ farewell speech, which he addresses to the Israelites just before taking possession of the Promised Land. Even if the author of Deuteronomy mainly looks back on Israel’s experiences during their desert journey, he also pays attention to Israel’s future living inside the land. In this context, the motif of Israel’s kingship ineluctably has to play a role, as Deut 17,14-20 makes clear. Although, within the Greek translation of the book of Deuteronomy, the royal terminology (מלך and ממלכה) systematically has been translated by the Greek terms βασιλεύς and βασιλεία, within the context of Deut 17,14-20 the terms ἄρχων and ἄρχή are used. As such, the translator seems to have intended to distinguish Israel’s ideal king from the foreign kings Israel is confronted to.
Ausloos, H. (2017). The Book of Deuteronomy and the Ideal King. 4th International Conference on the Theology of the Septuagint: Divine Kingdom and Kingdoms of Men, Thessalonique. https://hdl.handle.net/2078.5/226941