The Dragon Masters
Wikipedia on Dragon masters:
It won the Hugo Award for Best Short Story in 1963. The story describes a human society living under pre-industrial conditions that has bred lizard-like intelligent aliens to function as warriors, and an encounter with a ship from the alien planet, containing both the same aliens, and humans bred by them for similar purposes. (accessed 15 March 2019)
The apartments of Joaz Banbeck, carved deep from the heart of a limestone crag, consisted of five principal chambers, on five different levels. At the top were the reliquarium and a formal council chamber: the first a room of somber magnificence housing the various archives, trophies and mementos of the Banbecks; the second a long narrow hall, with dark wainscoting chest-high and a white plaster vault above, extending the entire width of the crag, so that balconies overlooked Banbeck Vale at one end and Kergan’s Way at the other. (more)
Republished by Spatterlight, 2012: The Dragon Masters.