George R. R. Martin ties many historical parallels into A Song of Ice and Fire, particularly the series of civil wars in England called the Wars of the Roses. These wars were fought between the Yorks and Lancasters, the two branches of the royal House of Plantagenet. The conflicts resulted in ending of both direct male lines leaving only female claimants and their heirs. The two warring lines were united with the marriage of Henry VII Tudor (a Lancastrian claimant) and Elizabeth of York (the oldest daughter of Edward IV), helping to bring the conflict to an end.
Martin created a series of wars between the Targaryens and the Blackfyres, a legitimized branch of the royal family. The male line of the Blackfyres is extinguished in the War of the Five Penny Kings while the male line of the Targaryens dies in or after Robert’s Rebellion, leaving only a female claimant, Daenerys Targaryen, and men who descend from female lines of the royal family, the Baratheons and possibly Aegon/Young Griff. While Aegon was raised to believe he is the son of Rhaegar Targaryen and Elia Martell, it’s possible that he is the seventh attempt of the Blackfyre family to take the throne, this time disguising their claimant as a claimant from the opposite side.
Daenerys has parallels to both Henry VII and Elizabeth of York while Aegon has parallels with both Henry VII and Perkin Warbeck. Like Elizabeth, Daenerys’ lineage is from the direct royal line without dispute and others wish to use her claim through marriage, but like Henry VII, she spent many years in exile and was pursued by the reigning king. Like Henry VII, Aegon’s claim would come through his mother, who herself descended from the illegitimate line of the royal house and he grew up in exile, but like Perkin Warbeck, he is being passed off as a presumed dead prince.
The political side of this novel series could end with the union between Daenerys and Aegon, uniting the red dragon with the black, just as the union of Henry VII to Elizabeth of York united the red rose to the white.
Considering that the sixth ASOIAF book will feature the White Walkers more prominently now that winter is here, I'd say it's a given that the theme of death/life and everything in between will be a major focus throughout.
With Aegon finally making his entrance into the Westerosi playing ground, his story will likely have elements of this as well.
Kings have many titles and monikers and Aegon won't be any different. He was believed dead for ~17 years and now he's suddenly shown up alive claiming to be the rightful heir.
Something to note is that, after Aegon the Conqueror, GRRM follows a particular naming convention. The monikers given to the other King Aegons are all quite similar, in that they began with the letter 'U':
- Aegon the Usurper
- Aegon the Unlucky
- Aegon the Unworthy
- Aegon the Unlikely
Aegon VI could very well follow this pattern and be dubbed Aegon the Undead.
It also adds an interesting contrast with "his brother", Jon Snow. TWOW is probably going to give us a Jon who will literally be undead. We already have Aegon claiming to be the son of a man who most likely isn’t his father, but is the biological father of Jon. So it's not out of the realm of possibility that Aegon holds the title of "Undead" while not having died in any sense, meanwhile Jon will be the one who actually died and came back.
It’s always fun to think about how elements of Aegon’s story often reflect Jon’s story. They’re distorted reflections, but reflections nevertheless.