In 184 AL Aegon IV Targaryen, king of Westeros legitimized all of his bastards as he lay dying. Among these men and women, who would become known as "Great Bastards", were Aegor "Bittersteel" Rivers, Shiera Seastar, Brynden "Bloodraven" Rivers, and most importantly Daemon Blackfyre. These four "Great Bastards" entered into the line of succession after Aegon IVs heir, Daeron II.
The year is 194 AL, ten years since the death of Aegon IV and rise of his bastards. Tension runs high in Westeros, as the kings legitimacy to the throne is called into question. Some whisper that Daeron relies too heavily on his Dornish queen, Myriah Martell. Others talk of his mothers affection for his Uncle, Aemon the Dragonknight, questioning as to who was really his father.
King's landing is the center of this, as forces begin jockeying for power in the kingdom, the tides of war on the rise as the Dance of Blackfyre begins.