'Royal' in the Bible

Adonijah sacrificed sheep and oxen and fattened steers by the Stone of Zoheleth, which is beside [the well] En-rogel; and he invited all his brothers, the king’s sons, and all the men of Judah, the king’s servants [to this feast].

Besides, Solomon has taken his seat on the throne of the kingdom.

then I will establish the throne of your kingdom over Israel forever, just as I promised your father David, saying, ‘You shall not be without a man (descendant) on the throne of Israel.’

King Solomon [in turn] gave to the queen of Sheba everything that she wanted, whatever she asked, besides what he gave to her from his royal bounty. So she returned to her own country, she and her servants.

Then the Lord stirred up an adversary against Solomon, Hadad the Edomite; he was of royal descent in Edom.

Now the king of Israel and Jehoshaphat king of Judah were each sitting on his throne, dressed in their [royal] robes, [in an open place] at the threshing floor at the entrance of the gate of Samaria; and all the prophets were prophesying before them.

The king of Israel said to Jehoshaphat, “I will disguise myself and enter the battle, but you put on your [royal] clothing.” So the king of Israel disguised himself and went into the battle.