Avaryan Rising6 books in series
The Hall of the Mountain King Publisher's Summary
The king's heir of Ianon is long lost, vanished into the south. Her father refuses to name his son heir in her place, though that son is a mighty warrior. Then one day a young wanderer arrives with news that both breaks and heals the king's heart: His heir is dead, but before she died, she gave birth to a son. That child, now grown, has come to take her place. But the king's son will not surrender his hope of kingship to a boy without a father, though he claims to be the son of a god.