Duncan Targaryen

Duncan Targaryen, also called Duncan the Small or the Prince of Dragonflies​, is an unseen character in Game of Thrones. He has only appeared on the HBO Viewer's Guide to date. He is long dead by the time the series begins.

Background
​​Duncan was the eldest son and heir of King Aegon V Targaryen. He was named in honour of his father's great friend Ser Duncan the Tall. He died alongside his father and his namesake in the Tragedy of Summerhall.

In the books
In the A Song of Ice and Fire novels, Duncan was the eldest son and heir of King Aegon V Targaryen, named after his close friend Ser Duncan the Tall. He once defeated the ten-year-old Barristan Selmy in a tourney at Blackhaven. Prince Duncan took pity on the small knight and jousted against him when no one else would, giving Barristan the nickname "the Bold". Years later he was defeated by Ser Barristan at a winter tourney in King's Landing.

Prince Duncan fell in love with a woman known as Jenny of Oldstones and loved her so much he gave up his crown for her and married her against his father's wishes. His love for her inspired a song. He died in the Tragedy at Summerhall alongside his father and his namesake.