The Lymond Chronicles are wonderful. There is also Dorothy Dunnett's Italian series The Spring of the Ram.
It was MN which introduced me to the Chronicles of St Mary's which are excellent.
Phillipa Gregory's historical novels are excellent - based in the lives of real people. Also Wolf Hall.
A lesser-known historical writer Judith Merkle Riley is a favourite of mine. I do recommend her novel A Vision of Light, loosely based on the life of Margery Kempe. She has a quirky edge to her writing which I really enjoy.
Connie Willis' To Say Nothing of the Dog is a very funny time travel novel.
And Susanna Kearsley's books often have a time-travel element - Marianna comes to mind, but I've enjoyed all of them.
For big, fat historical books, Sara Donati's series set in America were pretty good, and I'm not normally a fan of the sweeping saga thing. Mind you, I've only read the first two, but I enjoyed them, while I really struggled with Outlander and game up pretty quickly. The first one is Into the Wilderness set in colonial America.