Crown of Three
From the publisher:
Toronia, a kingdom composed of three realms, is wracked with civil war. King Brutan rules with an iron fist. Cruelty and suffering abound. The kingdom’s only hope comes in the form of Brutan’s illegitimate triplets, prophesied to kill the king and rule together in peace. But the road to the throne is long and bloody. Separated at birth and scattered throughout the realms, the triplets face a desperate fight to secure their destiny. Will they survive long enough to rule?