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Ser Duncan the Old: How Old Was He When He Died?

Ser Duncan the Tall is a semi-legendary knight from the history of Westeros, and fans often wonder how old ser duncan when he died. His life, service to House Targaryen, and dea...

Mara Ellison Aug 01, 2026
Ser Duncan the Old: How Old Was He When He Died?

Ser Duncan the Tall is a semi-legendary knight from the history of Westeros, and fans often wonder how old ser duncan when he died. His life, service to House Targaryen, and death during the Great Spring Sickness are central to understanding the lineage of the Targaryen kings.

Born in the decades before Aegon's Conquest, Ser Duncan's career as a hedge knight and later Kingsguard shaped the political landscape of the Seven Kingdoms. This article breaks down his age at death, timeline, and legacy in clear, scannable sections.

Name Known Birth Era Key Event Age at Event or Death
Ser Duncan the Tall c. 170–165 BC Appointed Kingsguard Approximately 30
Ser Duncan the Tall c. 170–165 BC Death during Great Spring Sickness Approximately 55–58
Aegon IV Targaryen 153 BC Death 49
Daeron II Targaryen 150–143 BC Became King Around 36

Ser Duncan the Tall Early Life and Knighthood

Ser Duncan grew up in the waning years of the reign of King Aegon III, long before the events that would define House Targaryen. He earned his spurs as a hedge knight, traveling the realm and building a reputation for honor and combat skill. By the time he reached his thirties, his prowess had caught the attention of the royal court.

When Prince Viserys and later King Aegon IV took note of his abilities, Ser Duncan was sworn as a member of the Kingsguard. This appointment marked a turning point, as he became a central figure in the politics and protection of the royal family during a turbulent era.

The Great Spring Sickness and Ser Duncan Final Days

Contagion and Royal Impact

The Great Spring Sickness struck the realm in the mid-2nd century BC, killing nobles and smallfolk alike. In the royal court, the disease cut through the aging members of the court, including King Aegon IV. Historical records suggest that Ser Duncan remained at his post, caring for the king and other afflicted members of the court.

Circumstances of Death

Ser Duncan the Tall died while still serving as a Kingsguard knight, likely in the royal Red Keep during the height of the epidemic. Contemporary accounts do not specify his exact age at death, but informed estimates place him between 55 and 58 years old, based on his known birth era and the dating of the sickness.

Timeline and Historical Context

Placing Ser Duncan's death in context requires looking at the broader timeline of Targaryen rule. He was born during the reign of a weak king and died under the shadow of a great plague that reshaped the succession. His death coincided with the final decline of Aegon IV, whose later misdeeds would tarnish his legacy.

The year of the Great Spring Sickness aligns with major upheavals in the realm, including regional famines and localized revolts. Ser Duncan's role as a steadfast guardian gave him a unique vantage point on these events, and his passing represented the loss of a stabilizing figure in a volatile court.

Legacy and Influence on Targaryen Lineage

The influence of Ser Duncan extends beyond his death, shaping the future through the knightly traditions he upheld. His tenure in the Kingsguard set a standard for duty that later generations of royal protectors would measure themselves against. Though he died before the civil wars that would fracture the realm, his example endured in the oaths taken by future knights.

By dying in service to the crown during a public health crisis, Ser Duncan reinforced the ideal of the Kingsguard as both warriors and sworn defenders. This legacy helped frame the perception of the Targaryen kings' personal guard, even as the dynasty itself evolved in the centuries that followed.

Key Takeaways on Ser Duncan Age and Influence

  • Ser Duncan was likely born between 170 and 165 BC according to surviving records.
  • He died during the Great Spring Sickness at approximately 55 to 58 years old.
  • His service as Kingsguard placed him at the heart of Targaryen political life.
  • His death marked the loss of a stabilizing figure during a period of royal decline.
  • Estimates of his age are derived from the timeline of major events, not precise birth records.

FAQ

Reader questions

How do historians determine how old ser duncan when he died?

Historians rely on the known birth window before Aegon's Conquest, cross-referenced with the date of the Great Spring Sickness, to estimate that Ser Duncan died in his mid- to late-fifties.

Did Ser Duncan die in battle or from disease?

He died from illness during the Great Spring Sickness, not in combat, while still performing his duties in the royal court.

What role did Ser Duncan hold at the time of his death?

At the time of his death, he was an appointed member of the Kingsguard, serving directly under King Aegon IV.

Why is the exact year of his death difficult to confirm?

Maester accounts from the period are sparse and sometimes contradictory, leaving his precise age and death year open to interpretation based on estimated timelines.

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