The Prince of Tabor (The Brotherhood of the Black Arrow Book 1) by Dr. W. Penn White

Nathaniel is a 17-year-old stable hand, growing up in the backwater hamlet of Streamside, a prince, but he doesn’t know he’s a prince, raised by his brother who really isn’t his brother, heir to a kingdom he doesn’t even know exists. This is the story of Nathaniel’s revelation and his journey to find himself and reach his destiny as King of Tabor, the most powerful nation in the West. He must overcome war, magic, witchcraft, and the relentless pursuit of assassins to achieve his goal.