Catria

Catria is a member of the Whitewings, a Macedonian squad of pegasus knights commanded by Princess Minerva. She is the second eldest of the Pegasus sisters. She is the younger sister of Palla and the older sister of Est. When Minerva's younger sister, Maria, is held in captivity to blackmail the elder princess into fighting against the Archanean League, Catria and her sisters are forced to fight too. However, as Maria is rescued by Prince Marth, they become free to join his army and fight alongside Minerva again.

(Source: Fire Emblem Wiki)