The Dragonpit, and the hill it stands on, are symbols of the Targaryen rule . Three hundred years ago, Aegon the Conqueror and his two Targaryen sisters/wives (yes, he married his siblings) climbed aboard their dragons and conquered Westeros, as one does when one has dragons. Unfortunately, Aegon’s beloved sister/wife, Rhaenys, was shot from the sky somewhere over Dorne. Aegon named one of the three prominent hills in King’s Landing after her. After becoming the King and converting to the Faith of the Seven, Aegon erected the Sept of Remembrance atop Rhaenys Hill, in honor of his sister/wife.