'Royal' in the Bible

He also took off his [royal] robes [and armor] and prophesied before Samuel and lay down naked all that day and night. So they say, “Is Saul also among the prophets?”

Then David said to Achish, “If I have found favor in your sight, let me be given a place [of my own] in one of the cities in the country, so that I may live there; for why should your servant live in the royal city with you?”