Mikoto

Mikoto is the biological mother of Corrin, stepmother of Ryoma, Hinoka, Takumi, and Sakura, and adoptive mother of Azura, all of whom she loves dearly. She is also the biological grandmother of Kana.

At some time in the past, Mikoto became Sumeragi's second wife after his first wife's passing and became his second queen consort. She ruled alongside her new husband for some time, but her marriage was sadly short-lived, and she became the new Queen of Hoshido after Sumeragi's tragic death at the hands of the King Garon of Nohr after protecting Corrin from arrows from Garon's soldiers. She is a kind and polite woman who cares deeply for her new people and is loved by the citizens in turn despite her unknown origins, and rules with the help of the first prince Ryoma. She has the services of Orochi, and Reina as her direct retainers, and Yukimura as her tactician. Previously, Kagero was one of her retainers, but she requested that Kagero pledge her services to Ryoma when he needed to find retainers.

(Source: Fire Emblem Wiki)