Gallowsgrey

Gallowsgrey is a location in the Stormlands. It is the seat of House Trant

History
In 44 AC, a duel between Axel Baratheon and Steffon Trant took place at Gallowsgrey. Axel was defeated and later succumbed to his wounds.

Season 1
Gallowsgrey is mentioned in Axel Baratheon's entry in The Lineages and Histories of the Great Houses of the Seven Kingdoms.

In the books
In the A Song of Ice and Fire novels, less is known about Gallowsgrey, and its existence is semi-canonical.