When it comes to nobles, the ceremony wasn't that complicated. The groom was supposed to wait for the bride in one of the most important locations at the place the ceremony was being held and then wait for the owner of the place to show up with his sword. After that, the father of the bride and the bride would head together to that same place, and then he would leave the bride with the groom, and then they would make an oath while touching the sheathed sword.
The owner of the castle was the king, and so he was also the father of the bride, so some things had to be changed. Vangel entered the throne room while holding a golden sword in both hands and then proceeded to the front of the throne, where he would wait for his father to come.