The entire point of House of the Dragon is who will be the one to take over the Iron Throne after Viserys' death: Rhaenyra or Aegon II. His brother Daemon (Matt Smith) also briefly took the title of King of the Stepstone Islands in House of the Dragon episode 4, 'King of the Narrow Sea.' This shows that even early on in Westerosi history, when the Targaryens were at the height of their power centuries prior to Game of Thrones, the authority that comes with the title of King or Queen in Game of Thrones wasn't universally recognized. This leaves a power vacuum that leads to the Targaryen Civil War, also known as the War of Greens and Blacks, or the Dance of Dragons.

House of the Dragon starts towards the end of his rule though, and before the first season finishes, he dies.

He is an old and respected leader, and he commands as much loyalty as a King can in the regicide-obsessed Seven Kingdoms. Portrayed by Paddy Considine, the first Viserys Targaryen is very different from Daenerys' brother, Viserys III, in Game of Thrones. House of the Dragon is set 200 years before Game of Thrones, 129 years after the Targaryens first conquered Westeros), and when it starts, King Viserys I occupies the Iron Throne - but that's set to change as events play out. A great battle ensues at Winterfell between the armies of the living and the dead, during which the Night King is destroyed by Arya Stark using a Valyrian steel dagger, ending his reign of terror. During Game of Thrones season 8, the Night King successfully breaches The Wall and leads his forces south. The Night King's army was eventually driven north by the First Men and The Children, and The Wall was built to keep the White Walkers from invading again.

The Night King waged war on Westeros, blanketing the continent in darkness during an age known as The Long Night. The White Walkers were created to defeat the invading First Men, but The Children could not control their own creation. Season 6 reveals that the Night King was originally human - one of the First Men who inhabited Westeros - until he was transformed by the Children into the very first White Walker. The supernatural threat facing every king and kingdom in Westeros is the White Walkers, led by the frightening Night King in Game of Thrones.

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