Shackle and Sword — Alanna Morland

SLAVE
The son of an innkeeper, Farris possesses an expertise with swords and horses that is uncanny. He desires to join the King's Elite and leave his life of servitude. But when his mother dies, Farris' dreams become nightmares, as his stepfather sells him into slavery...

SORCERER
But Farris is not alone. Ydona, Lady of Horses, and Likarion, God of Warriors, both watch over Farris, each desiring his fealty. With their guidance, he finally escapes, and encounters his father's people--who teach him the magic that is his birthright.

WARRIOR
Now, as a mercenary for hire, Farris will confront the horrors of his past. His former "master" has abducted the young Queen Ashlana. And only by disguising himself as a slave can he infiltrate the keep and rescue the beautiful regent--with whom he is falling in love...