In the year of 92 ac after the death of king jaehaerys heir Aemon Targaryen. Aemon's death caused an issue with the succession, as Aemon's only child was a daughter named rhaenys Leaving jaehaerys to chose his youngest Baelon to take the throne after him unfortunately that would last long as in 101ac prince Baelon went on a hunting trip the worsened within the days to fallow. Which left him bed ridden after 5 Days eventually dieing to burst belly in 101. Leaving behind 3 living sons .
In 101ac after the passing of prince baelon the line of succession was at question of who would get the irone throne when he was gone . After 13 days of the council and over hundred of lords from around westeros. 14 claims were brought to attention but 9 were quickly discarded . Vaegon being one who took an oath would not break his vows. And princess Rhaenys and her daughter leana being discarded as well do to there gender the 2 major canadates were viserys 1 son of baelon and Alyssa and laenor of house velaryon .
In the end, the lords in the realm saw the most importance in having the male line taking precedence over the female line. After the vote it ruled in viserys favor as him taking the Iron throne making him king viserys 1 first of his name and his wife queen aemma after the death of king jaehaerys in 103 at the age of 69 his reign lasted from 48ac-103ac being on the longest kings in the Targaryen dynasty. Kings viserys sat the Iron throne in 103 with his wife an queen aemma and daughter princess Rhaenrya