Outlander, by Diana Gabaldon; Delacorte Press, 1991. There's something about time-travel books written outside the science-fiction realm that I find offputting, and I definitely prefer my historical fiction unadulterated by such things, but this series is reasonably good despite that.
Dragonfly in Amber, by Diana Gabaldon; Delacorte Press, 1992.
The Wizard of Karres, by Mercedes Lackey, Eric Flint, and Dave Freer; Baen, 2004. James H. Schmitz wrote a number of enjoyable tales, including that delightful romp The Witches of Karres. The Wizard of Karres is a reasonably good sequel. I'll have to re-read the original sometime soon.
Random musings on books, code, and tabletop games.