הלכה אויף דברי הימים א 17:16

Should one of the king’s relatives die, the king must not pass the threshold of his palace¹¹Or, chambers.. When he is being comforted¹²With the mourner’s meal., the entire nation sits on the ground and he sits on an ottoman¹³Or, footstool.. If he was a descendent of David, he may sit in the Courtyard (Azaroh) of the Temple since only kings from the House of David may sit in the Temple Courtyard, as it says, “And King David came, and he sat before G-d” (II Samuel 7:18, I Chronicles 17:16).