Viserys Targaryen ruled the Seven Kingdoms after his grandsire, Jaehaerys I, passed away. He was elected as the new Prince of Dragonstone at the Great Council of 101 AC, which lies at the beginning of House of the Dragon. Viserys took over the reins of the powerful Targaryen dynasty during a transitional stage between the old and the new. A shrewd king makes a good king, but Viserys was more into history and philosophy than politicking.