I love well written and researched historical fiction. Not, bodice ripper historical fiction, if you know what I mean. Someone I know actually said that Outlander was historical fiction and I just about barfed. It's time travel romance disguised as historical. Not that I didn't enjoy the first few of that series, it's just NOT historical fiction. Sorry.
Sharon Kay Penman writes about Medieval England and I love her books.
The Welsh trilogy, Here be Dragons, Falls the Shadow, and The Reckoning, is fabulous. Her series on Henry II is also very good, and her take on Elanor of Aquitane.
http://www.sharonkaypenman.com/penman_bibliography.htm
For adventurous historical, you can't beat Bernard Cornwell. He's covered the Napoleonic Wars with the Sharpe series , King Alfred the Great with his Lords of the North series, and he's also done some great books on the Civil War. The Sharpe series is cut of the same cloth as the Patrick Obrien/Jack Aubrey stuff, so it's adventure tales with a lot of historical basis and detail. ( And Sean Bean played him in the BBC series, what's not to love about that?)
I've also really enjoyed the Thomas Shardlake mysteries set in the time of Henry VIII, by C J Sansom. This is literary mystery, not the usual fluff of many mystery series. It's pretty deep stuff, and very authentic to the period.
I could not get into Phillipa Gregory at all. I read one of them, and it seem so contrived I had to toss it. It may have been one of her true fiction and not the bios she's known for.
Wilbur Smith is another author I like. He writes about Africa, primarily South Africa, from about the 17th century on. The history is told through the Ballentyne Family, from the earliest settlement by Dutch to the end of Apathied. His really "famous" book ( ie, supermarket bestseller) "River God" is not his best work.
Hope you find something you like! I love reading on my Nook and iPad.
Who is on Goodreads?