Here's why:
* The Trojan War: The epic tale of Troy, including the Trojan Horse, is centered around the Trojan War, a central event in Greek mythology.
* Homer's Iliad: The most famous account of the Trojan War is the epic poem *The Iliad*, attributed to the ancient Greek poet Homer.
* Greek Gods & Goddesses: Greek gods and goddesses, such as Zeus, Hera, Athena, and Aphrodite, play crucial roles in the Trojan War narrative.
* Location: The city of Troy, where the war took place, was located in Anatolia (modern-day Turkey), well outside the territories traditionally associated with Celtic cultures.
While there are some parallels between Celtic and Greek mythology, such as stories of heroes and battles, the specific story of Troy belongs to the Greek mythological tradition.