Alcázar - King: Gaiden

(from ebookjapan):

Constancia, the second daughter, is the heir to Don Pedro's legacy. After marrying John of Gaunt, Duke of Lancaster, she struggles to recapture her late country Castile in England, but...?

In addition to "The Duchess's Chronicle," which describes the battles of those left behind after the king's death, "The Flight of the Angel" and "The Road to the Ends of the Earth" are also included.