Troilus was the sixteen-year-old son of King Priam of Troy and the younger brother of Hector, Paris and Cassandra. He killed the Greek warrior Achilles in revenge for the death of his brother Hector in circa 1200 BC.
After the Trojan War, he and fellow teenager Vicki Pallister, who had changed her name to Cressida, settled down with Troilus' cousin Aeneas. (TV: The Myth Makers)
Troilus and Vicki later left Aeneas' group with several others. At one point in their travels, they came across the Eighth Doctor, who was travelling with Charley Pollard and a young William Shakespeare. (PROSE: Apocrypha Bipedium)