Est

Est is the youngest of the Pegasus Sisters of Macedon under Minerva's command. Unlike her elder sisters Palla and Catria, she joins late in the game, as she decided to steal Mercurius before returning. She falls in love with the knight Abel, and eventually marries him and moves to Altea.

She and her sisters also appear in Fire Emblem Gaiden. According to Est, Palla, and Catria's base converstions in the remake, Est had left the Whitewings the day after the War of Shadows, wanting to open up a shop with Abel and live a normal life. Unfortunately, Est ends up getting captured by Grieth, and her sisters follow the pirate ship to rescue her, but they lose sight of it near Zofia Harbor. Jesse tries to save Est, but gets captured. After Celica's party rescues Jesse, they travel to Grieth's fort, defeat Grieth, and save Est. After the war, she returns to Archanea with her sisters, but promises to come back some day.

(Source: Fire Emblem Wiki)