Greatest Dynasties.

If I were to pick Jagiellonians as the greatest one of my biggest arguements would be because of the marriage between Kazimierz Jagiellonczyk and Elizabeth of Austria (or of Hapsburg) the offspring these two created earned Elizabeth the nickname of "mother of kings", in one book i read someone stated (i think, i dont have th ebook in front of me, going off from what i remember) that every royal family could trace their roots from this couple here, Kazimierz and Elizabeth.
... i could be wrong though.