A king should have his hair cut every day. He should dress and adorn himself in attractive and impressive garments, as Isaiah 33:17 states: 'Your eyes shall behold the king in his beauty.'
He sits on his throne in his palace and has a crown placed on his head.
When he desires, the nation must present themselves before him. They should stand before him and prostrate themselves to the ground. Even a prophet must stand before the king and prostrate himself on the ground, as I Kings 1:23 states: 'Behold, Nathan, the prophet came before the king and prostrated himself before the king.'
However, a High Priest need not come before the king unless he the High Priest desires to do so. The High Priest need not stand before the king. Rather, the king stands before the High Priest, as Numbers 27:21 states: 'And he shall stand before Elazar, the priest.'
Nevertheless, it is a mitzvah for the High Priest to honor the king by having him seated and standing in his presence when he visits him. The king should only stand before him when he consults the Urim and Tumim.
Similarly, it is a mitzvah for the king to honor students of Torah when they enter his presence. He should stand before the Sanhedrin and the Sages of Israel and seat them at his side.
Jehosephat, King of Judah would follow this practice. Whenever even a student of a Torah scholar would come to him, he would rise from his throne and kiss him and address him as 'My teacher and master.'
When does the above apply? When the king is alone in his palace. Then, in private, before his servants, he should behave in this fashion. However, in public, before the people at large, he should not conduct himself in this manner. He should not stand before anyone. He should not speak gently and should address a person using his name alone in order that the awe of him will be implanted in everyone's hearts.