Miraz's Castle was home to the early Telmarine Dynasty (the "Caspians") of the Kingdom of Narnia

Narnia (country)

In C. S. Lewis's Chronicles of Narnia series of novels, Narnia is the country around which the books revolve. It is one of several lands in the Narnian world.-Geography:...

. The castle was built by Caspian VI and was home to him and his successors, including Caspian VII and Caspian VIII. The last permanent ruler of the palace by the name of "Caspian" was Caspian IX, who was murdered and succeeded by his brother Miraz

Miraz

Miraz is a fictional character from C. S. Lewis's fantasy series The Chronicles of Narnia. He is the main antagonist in the second book Prince Caspian, and is the uncle of the book's protagonist....

. After Miraz was murdered at the Second Battle of Beruna

Second Battle of Beruna

In The Chronicles of Narnia novels, the Second Battle of Beruna is a part of The War of Deliverance as mentioned in The Last Battle.-History:...

, Caspian X

Caspian X

Caspian X, King of Narnia, Lord of Cair Paravel and Emperor of The Lone Islands, also called Caspian the Seafarer and Caspian the Navigator, is a fictional character in The Chronicles of Narnia by C. S. Lewis. He is featured in three books in the series: Prince Caspian, The Voyage of the Dawn...

 may have lived in it briefly while king before rebuilding Cair Paravel

Cair Paravel

Cair Paravel is the fictional castle where the Kings and Queens of Narnia rule in The Chronicles of Narnia. It is the location of the four thrones of High King Peter the Magnificent, Queen Susan the Gentle, King Edmund the Just, and Queen Lucy The Valiant....

 and making it his new palace.

The castle is featured in Prince Caspian

Prince Caspian

Prince Caspian: The Return to Narnia is a novel for children by C. S. Lewis, written in late 1949 and first published in 1951. It is the second-published book in the Chronicles of Narnia series, although in the overall chronological sequence it comes fourth.-Plot summary:While standing on a...

.