From the very first episode, House of the Dragon has established that its main story is about the succession of King Viserys Targaryen. He named his daughter, Rhaenyra, as his successor, since he didn't have a son to take over for him. After marrying Alicent Hightower, however, Viserys had multiple sons and many believed he should make the oldest of them the next King, but he stuck to his ground and kept Rhaenyra as the next in line. At the end of last week's episode, Viserys died, leaving Westeros without a king. This week's episode officially put the next ruler on the Iron Throne.