For the new poll:
I'll go with Daeron I the Young, only fourteen and conquered Dorne. Albeit, he died at eighteen trying to quell the subsequent uprising in Dorne... but it still remains, he was the first Targaryen King to conquer Dorne and unite all seven kingdoms for the first time. That's pretty great by my account, especially comparing what a lot of the other Targaryen Kings did.
Baelor I the Blessed was to nutty for me. The people liked him for sure, but he reminds me of a hippie / super zealot religious nut.
I wonder why people are voting for Aerys II the Mad King, I wouldn't consider someone who lost the throne for his family and got most of them killed as great. I suppose they're thinking pre-Defiance of Duskendale...