Aerys

After his Aunt Lyanna eloped with Aerys's son, Rhaegar Targaryen, Bran's Uncle Brandon rode to King's Landing to ask Aerys to return her.

Aerys II Targaryen's actions catalyzed Robert's Rebellion, and here is why Game of Thrones lore remembers him as the Mad King.

Robert succeeds Aerys II as King in and establishes the Baratheon royal house.

Daenerys always had the potential to be a "villain," and the realization of her arc in the final seasons delivers, with Daenerys carrying out what her father the "Mad King" Aerys put in motion before her birth.

Rhaegar is the eldest son of Aerys II Targaryen and, by all accounts, was a fantastic person.

Brienne and Jaime are taken to Harrenhal, where Jaime reveals to Brienne that he killed the Mad King Aerys II Targaryen to stop him from burning King’s Landing.

It has always been assumed that Aerys’ madness was down to years of Targaryen inbreeding, but maybe Bran had a role to play in his downfall.

This was all going on during the time of the 'Mad King' Aerys II Targaryen - who Robert Baratheon, Jon Arryn and Ned Stark fought to overthrow from the Iron Throne.

When Robert won the war against King Aerys II, he named Jon Arryn Hand of the King.