Young Adult Fantasy book where some people, like the female protagonist with super strength, are called a special name with their special powers

Question

• Synopsis: Some people are born with special powers and they are called something in the book. The main character is one of these somethings and their power is essentially super-strength and is the daughter of the king. Therefore, she is forced to basically do his dirty work for him. I remember that, at one point, the main character (I think her name was Kristin) falls in love with a prince (named Rowan?).

• Genre: Young Adult Fantasy

• Read: Probably 10 years ago.

• Publication: Also probably 10 years ago.

• Book Details: Hardcover, written in English

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If I remember anything else, I'll edit it in!

Answer 1

On the off chance Adamant did a hit and run answer comment:

Graceling by Kristin Cashiore, first book of the Graceling Realm series.

Katsa has been able to kill a man with her bare hands since she was eight—she’s a Graceling, one of the rare people in her land born with an extreme skill. As niece of the king, she should be able to live a life of privilege, but Graced as she is with killing, she is forced to work as the king’s thug.

She never expects to fall in love with beautiful Prince Po.

She never expects to learn the truth behind her Grace—or the terrible secret that lies hidden far away . . . a secret that could destroy all seven kingdoms with words alone.