Knight or Knave
Andre Norton
The Cycle of Oak, Yew, Ash, and Rowan (2)
Breeds There a Man?
Isaac Asimov
Krispos Rising
Harry Turtledove
The Tale of Krispos (1)
Proving Grounds
Apollos Thorne
Underworld (4)
The Dominant
B.V. Larson
Imperium: Mech (0.0)