User blog comment:B214/Question and Answers 6/@comment-185.112.105.215-20161212173441/@comment-26821288-20161212205325

Dragons are far superior from other beings in DxD, so natrually, the kings of the Dragons, will overcome the kings of any other being. Though Devils, are kind of exception, because of Sirzechs and Ajuka. If you don't count these two, the answer is absolutely yes. But if you do count them... it's hard to tell. Sirzechs and Ajuka are far stronger than a Dragon King, but when Dragons are angry... you don't wanna mess with them. So the Dragon Kings, if you count Sirzechs and Ajuka, may have a slim chance, but will most likely lose against Sirzechs and Ajuka.