'Royal' in the Bible

On an appointed day, Herod dressed himself in royal clothing, sat on the throne, and gave a speech to them.

However, if you fulfill the royal law, according to the Scripture, "You shall love your neighbor as yourself," you do well.

But you are a chosen race, a royal priesthood, a holy nation, a people for God's own possession, that you may proclaim the excellence of him who called you out of darkness into his marvelous light: