Born of Shadows - Sherrilyn Kenyon

Well… I'm frankly amazed. A hero who wasn't flogged, raped, told he was worthless (except by a spoiled and decidedly stupid adopted sister so she doesn't count). OTOH, he was nearly executed due to said sister's stupidity so…

 

He's a prince (cue Lonestar moment) who doesn't know it. He was kidnapped as a child by an aunt who just happens to be the h's aunt as well - no blood relation though. This was discovered at the nth second - just in time to allow him to keep his head. He met the h at a summit several weeks later where… the aunt frames the both of them for their parents' deaths. They get to spend the next unknown amount of time running and hiding.