What’s superlative historical fiction?

I’m always curious about discovering new genres I’ve never heard of (like poetic prose), but this time not even Google seems to be able to give me an answer (gasp!). I’ve read the term for the first time yesterday, in is this great post about the importance of Dorothy Dunnett in the literary and art history of Scotland. I actually got a little teary at times while reading it. It was written based on a talk the blogger gave during the “Fife Local Heroes and Dunfermline Diamonds” celebration of famous people born in the areas.

Is it something like the equivalent of “high-fantasy”? Epic and ambitious?