Warning: This article contains spoilers from theHouse of the Dragonseason 2 finale.
But nowHouse of the DragoncreatorRyan Condalis clarifying whether the decision to include Daenerys and not Jon (a.k.a.
Martin’s books) never answered that question definitively.

Matt Smith, ‘House of the Dragon’.Ollie Upton/HBO
“That is George’s world and George’s space to tell that story.
We’re more interested in playing with the character drama that lives in and around that imagery.”
That’s why Viserys named Rhaenyra as his successor, believing her to be the subject of the prophecy.

Emilia Clarke’s Daenerys Targaryen on ‘Game of Thrones’ season 1.HBO
“There’s a whole lot to unpack in there,” Condal said.
There needs to be some interconnectivity.
That is the interconnectivity."

Kit Harington, ‘Game of Thrones’.Helen Sloan/HBO
I was the one.
There is a Prince Who Was Promised, it must be me.
“It’s just a more complex idea,” he added.
“The connectivity for us is specifically in and around the dragons.
That could be his future daughter with Rhaenyra who has three dragons born.
So for that reason, I think it was important that it was Daenerys, the image.”
“Youre seeing growth growth sometimes does not necessarily mean all positive,” he said.
He thought I was the one.'
She starts looking for signs and portents that seem to indicate Viserys was right.
We know that thats potentially a dangerous path for somebody in a position of power."