Prunaprismia

Queen Prunaprismia was the wife of King Miraz I, the former king of Telmarine-ruled Narnia, the usurper of the throne from King Caspian IX, and the foe of the true Narnian king, Caspian X. Prunaprismia deeply loved her husband, but was a strong opponent of her relatives, including her brother-in-law, his wife and even her brother-in-law's son, her adoptive son Caspian X. Despite the fact she did not like Caspian, she allowed her husband Miraz to adopt him.

Miraz and Prunapismia however were selfish, and when Prunaprismia had a son, it became clear that because they now had a direct heir, and the troublesome Caspian would have  to be executed. Doctor Cornelius helped Caspian X escape the castle and he raised an army of people who suported the cause of Old Narnia. Prunaprismia was known to have red hair, though the rest of the Telmarines were considered dark-haired. After the Second Battle of Beruna, it is unknown what happened to the Prunaprismia or their nameless child (Caspian X's cousin), but it is likely that her son died young, because when Caspian X trys to abdicate near the end of The Dawn Treader, he says "all of you, led by the Lord Drinian, shall choose a new King" however as Caspian's cousin, he would be Caspian's heir until the birth of Rilian. Also, at the beginning of The Silver Chair, Caspian X sails East to look for Aslan to ask who will be King after him, since he has lost his son?

Prunaprismia in the film
In the Prince Caspian film, she is played by actress Alicia Borrachero. In the film, she has black hair rather then the red hair mentioned in the book, and she also weilds a crossbow during what appears to be the movie added Telmarine Castle Night Raid scene.