Colleen McCullogh's 6-book Rome series ("First Man in Rome", "The Grass Crown", "Fortune's Favourites", "Caesar", "Caesar's Women" and "The October Horse"). Not strictly historical, but *very* easy to read and good for making a formative period in western culture approachable.
T.H.White (of "Once and Future King" fame) on "The Age of Scandal" - 18th c. history (for work), and Roy Porter's "18th Century British History". Porter does great synoptical works (history of medicine, etc.) and it's interesting to see how he works on a smaller canvas.