Among dragons, kings, and queens, House of the Dragon has always saved some of its most interesting characters for those who exist on the margins of power. Perhaps that’s why there may be no more intriguing debut this season than that of Ser Luthor Largent, played by Tom Cullen.

I first wrote about Luthor in 2025, when his casting was announced, because readers of Fire & Blood know he occupies a very unusual place in the Dance of the Dragons. He isn’t a Targaryen, doesn’t claim the Iron Throne, doesn’t ride a dragon, and rarely appears on lists of fan-favorite characters. Yet he is present during some of the most important and morally ambiguous moments of the entire civil war.

Now, unconfirmed rumors and leaks surrounding this week’s episode suggest that HBO may be about to turn Luthor into something even more interesting—and far more disturbing—than his literary counterpart.

According to reports circulating among fans and spoiler accounts, Luthor will confront Alicent Hightower about her relationship with Ser Criston Cole. Some versions of those rumors go even further, suggesting that the scene could involve an attempted assault against the former queen. None of this has been confirmed by HBO, but if true, it would represent a major departure from the book and immediately place Luthor at the center of one of the season’s most uncomfortable storylines.

To understand why that matters, we first need to answer a simple question: who exactly is Ser Luthor Largent?

In Fire & Blood, Luthor is the Commander of the City Watch of King’s Landing—the famous Gold Cloaks. It is a particularly important position because the City Watch does not answer directly to dragons, lords, or dynastic disputes. Its duty is to preserve order in the largest city in Westeros precisely as that order begins to collapse.

That gives Luthor a unique place in the Dance of the Dragons. He knows all the major players in the war without truly belonging to any of them.

His most important connection is, ironically, with Daemon Targaryen. Long before the civil war, it was Daemon who transformed the City Watch into the efficient and feared military force known as the Gold Cloaks. Although George R. R. Martin never describes a close personal relationship between the two men, it is difficult to imagine that Luthor did not admire—or at least deeply respect—the prince who created the institution he would later command.

Luthor also exists within the same political world as figures such as Harwin Strong and Ser Criston Cole. There is no evidence of a direct relationship with Harwin, but his position in King’s Landing inevitably placed him in contact with the court’s most influential families and factions. With Criston Cole, however, the relationship is far more direct and important.

During the coup that places Aegon II on the Iron Throne, Criston relies heavily on the City Watch to secure King’s Landing. Luthor, therefore, becomes a crucial piece in the Greens’ consolidation of power. If the series ultimately suggests that he knew—or at least suspected—the relationship between Alicent and Criston, such a choice would not feel arbitrary. Very few people in Westeros were closer to the kingdom’s political secrets than the commander of the Gold Cloaks.

But perhaps Luthor’s most fascinating characteristic is his apparent lack of ideological loyalty.

He begins the war supporting the Greens. Later, when Rhaenyra captures King’s Landing, he changes sides and swears allegiance to the Black Queen. He then becomes associated with some of the darkest and most controversial episodes surrounding the capital’s collapse, including the events tied to Queen Helaena’s death.

Why does he switch sides?

The answer may be more interesting than any conspiracy theory, because Luthor is not fighting for Aegon, Rhaenyra, or Daemon. He is trying to preserve the city.

In many ways, Ser Luthor Largent may be one of the most modern characters in the entire Dance of the Dragons: a man tasked with keeping institutions functioning during a civil war being fought by people far more powerful than himself.

That ambiguity makes Tom Cullen’s casting particularly inspired.

Although many viewers still associate him with Downton Abbey, Cullen has built a career playing men torn between duty, faith, desire, and ambition. In Knightfall, he portrayed Landry du Lauzon, a Templar knight destroyed by the conflict between his religious convictions and his personal desires. In Becoming Elizabeth, he played Thomas Seymour, one of the most fascinating and morally ambiguous figures of the Tudor era, a man capable of shifting from charm to vulnerability to menace in a matter of seconds.

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It is fitting that Cullen has spent much of the last decade portraying men trapped between oaths, power, and survival. Ser Luthor Largent feels like the natural culmination of that journey.

In the end, Luthor’s story concludes in the only way possible for someone who devoted his life to preserving order during a civil war: he dies trying to defend a city that no longer believes in kings, queens, or vows. And perhaps that is what makes the rumors surrounding his debut so intriguing.

Because if HBO has truly decided to turn Ser Luthor Largent into something more than a military commander—if it has chosen to make him a man capable of crossing moral boundaries that even the book never explored—then we may be about to meet not merely a new House of the Dragon character, but one of the most uncomfortable and complex figures in the entire series.