“Yet I cannot help but wonder what will follow, when the last warmth leaves my body. Will I feast forever in the Father's golden hall as the septons say? Will I talk with Egg again, find Daeron whole and happy, hear my sisters singing to their children?" - A Feast for Crows

Though King Daeron was no warrior, two of his four sons seemed all that could be wished in a knight, lord, or heir. The eldest, Prince Baelor, won the name Breakspear at the age of seventeen, following his famous victory at Princess Daenerys's wedding tourney; he defeated Daemon Blackfyre in the final tilt. And his youngest son, Prince Maekar, seemed like to show a similar prowess. [...] the king had two other sons besides (though the realm was less certain about Aerys, bookish and obsessed with arcane matters, and Rhaegel, a sweet boy touched by madness).

Egg spoke up shrill and loud. “Prince Maekar is Prince Rhaegel’s brother. He loves him well. He’d never do harm to him or his.” - The Mystery Knight