Myrrh

Myrrh is a playable character from Fire Emblem: The Sacred Stones. She is the adopted daughter of Morva who lives with him in the Darkling Woods after her true parents were killed in the last great war. In Caer Pelyn, she is known as the Great Dragon. She acts as a companion to Ephraim, whom she addresses as "Brother" in their supports. Her support with Dozla reveals her age to be roughly 1200 years old.

(Source: Fire Emblem Wiki)