Prince of Summerhall
Prince of Summerhall was a title used by some younger sons of House Targaryen. While the heir apparent to the Iron Throne was known as the Prince of Dragonstone, younger siblings could receive the castle of Summerhall.
The pleasure castle of Summerhall was built by King Daeron II Targaryen. His son, Maekar, received the castle and became known as the Prince of Summerhall. In time, many sons of House Targaryen would hold the seat as Prince of Summerhall.