Aegon I Targaryen died in 37 AC, and was succeeded by his eldest son, Aenys I Targaryen.
Aegon V’s second son Jaehaerys II Targaryen ascended the throne in 259 AC but died after just three years of rule and was succeeded by his only son, Aerys II Targaryen AKA… “The Mad King”.
In 131 AC, Aegon II was poisoned by his own councillors and 11-year-old Aegon the Younger ascended the throne as Aegon III Targaryen.
Viserys II was succeeded by his eldest son, Aegon IV, who was rumoured to have been involved in his father’s death.