The bridegroom is like a king. Just as a king is praised by everybody, so is the bridegroom praised by everybody (during) the seven days of the feast. Just as a king is dressed in garments of glory, so the bridegroom is dressed in garments of glory. Just as a king is rejoicing, with feasts in his presence, all his days, so || the bridegroom is rejoicing and has feasts before him all the seven days of the banquet. Just as the king does not go into the market-place alone, likewise the bridegroom does not go into the market-place alone. Just as the face of a king is shining like the light of a sun, so the face of the bridegroom is shining like the light of a sun, as it is said, "And he is as a bridegroom coming out of his chamber, and rejoicing to run his course" (Ps. 19:5).
Why the Bridegroom Is Treated Like a King
Pirkei DeRabbi Eliezer 16:16