Introduction

The A Song of Ice and Fire series by presents a vivid and complex world filled with political intrigue and family drama. What would happen if a significant twist occurred, such as Steffon Baratheon having a daughter who married Rhaegar Targaryen? This hypothetical scenario would drastically alter the course of Westeros’s history, potentially shifting the balance of power and changing the fate of various key figures like Robert Baratheon, Stannis Baratheon, and even Daenerys Targaryen.

Impact on Robert Baratheon's Dynasty

The most immediate and significant consequence would be the complicated family dynamics within the Baratheon family. If Steffon had a daughter that married Rhaegar, Robert's reaction would be fiercely intense. He would initially be angered by the stealing of the "love of his life," Lyanna Stark, and the fact that his brother was now potentially the father of his niece and nephew. However, the true horror would arise if Rhaegar were to leave to pursue his prophecy, leaving his children behind.

Robert's frustration with Rhaegar could grow even further if he perceived Rhaegar as having betrayed Lyanna. This betrayal would raise questions about whether Rhaegar's children would be welcomed in the family. Despite this, the lack of a clear successor to the Iron Throne would mean that Aegon would likely be the heir, as he is Robert's nephew. This decision would likely prevent Robert from turning to kinslaying, an act that has significant moral and legal repercussions in Westeros.

Stannis Baratheon's Perspective

In contrast to Robert, Stannis would be less grim and melancholy. Rhaegar would remain united with his wife Elia Martell, who was too frail for a third child. This absence of another child would mean that Rhaegar would not seek a new mother for his offspring. If Lyanna were to be found by Rhaegar, she would most likely be the knight of the laughing tree, although the significance of this may vary. It's possible that this would not lead to Jon Snow's birth, which in turn would mean the endgame of the series would be less complicated, if at all, though this is open to interpretation.

The absence of a clear Stark-Baratheon-Arryn alliance could lead to a different reaction from those opposing Aerys II Targaryen. It is possible that Rhaegar could lead a successful coup against his father, as fewer houses would side with Aerys against him. This could significantly ease the burden on the Baratheons, potentially leading to a more peaceful transition of power.

The Potential Divergence in Westeros

The divergence in Westeros may begin even earlier, due to Steffon Baratheon's earlier death. Had he not died on his return journey from Essos to find a wedding bride for Rhaegar, the timeline would be different. Robert and Stannis might have not witnessed the sinking of their ship, which could have shifted their character arcs.

Assuming Steffon’s daughter married Rhaegar, the trip to find a bride would never have happened, and Steffon wouldn't have died. The implications for alliances would now be different. The presence of Stannis in the political landscape might mean more houses siding with House Baratheon. However, without the threat of the Others, Daenerys may grow up in Westeros without her dragons, altering the endgame for the series.

The character of the theoretical Baratheon daughter is crucial to this scenario. Her personality—whether power-hungry, impulsive, or faithful—could have a significant impact on the outcome. If she were to power-hungry and impulsive, the likelihood of a peaceful transition of power might be lower. On the other hand, if she were to be more loyal and faithful, the chances of a dramatic rebellion might be reduced.

Considering the range of potential outcomes, it is plausible that Rhaegar might peacefully assume the Iron Throne. Alternatively, Robert or Steffon might end up as regents. In the worst-case scenario, the seven kingdoms could fracture due to lack of a clear successor, leading to a series of smaller conflicts that might not involve the Iron Throne at all.

Conclusion

The proposed union of Steffon Baratheon's daughter and Rhaegar Targaryen presents a rich scenario that deviates significantly from the canon world. While the idea of multiple political alliances and complex familial relationships might sound far-fetched, it is a testament to the intricate nature of George R.R. Martin's intricate narrative. Such a scenario provides a fascinating exploration of power dynamics, family loyalties, and the pivotal moments that shape the world of Westeros.