“I have heard of the fell creatures in Darkling Woods. L’Arachel. You will need the Stone of Rausten if we have any hope of victory.”
Mansel (マンセル, Manseru?) is an unplayable character in Fire Emblem: The Sacred Stones. He is the theocratic ruler of Rausten, known also as the Divine Emperor. His heir is his niece, L'Arachel, whom he has lovingly raised ever since her parents perished when she was a young girl. During the game's events he is portrayed as pious and kindly, and willing to break with sacred tradition in order to support the Demon King's defeat. He is noted to be the keeper of the last Sacred Stone of Magvel, which was instrumental in the Demon King's eventual demise.
Mansel is similar to a pope in regards to his authority on both political and spiritual matters, and claims ancestry with Saint Latona, who was one of the Five Heroes of Magvel and the only one said to be pure enough to resist possession by the Demon King. The "Blood Beryl" Riev sought revenge on Mansel for excommunicating him from the religious order for heretical worship, and carries out an assault on Mansel's castle shortly after Ephraim and Eirika arrive there. You must defend him in Chapter 19 of Fire Emblem: The Sacred Stones and, in the end of the chapter, you get Ivaldi and Latona, the Sacred Twins of Rausten from Mansel himself.