Looking for a Historical Romance With a Wickedly Charming Male Lead Who’s Great at Flirting, Super Sweet, and Angst-Free

I want a story with detailed, nuanced character development. The male lead should be powerful, and the heroine shouldn't be stupid. He can be wickedly charming, carefree and unruly, cold and scheming, or sweet on the outside and dark within. He has to know how to flirt, flirt, flirt!