The Forgotten Legion by Ben Kane is set in the Republic Era of Rome 265-230 B.C.
The Fall of the Templars by Robyn Young takes place during the last days of the Templar Knights, during the rule of Richard I, 1239-1307 A.D.
The Physick Book of Deliverance Dane by Katherine Howe alternates between the Salem Witch Trials of Colonial Massachusetts and a grad student in the 1990's studying them.
Roanoke by Margaret Lawrence is a reimaging of what could have happened to the lost colony of Roanoke during the 16th century.
The Disagreement by Nick Taylor is about a Med Student during the American Civil War.