Blue Moon Rising and Beyond the Blue Moon, By Simon R Green. Also the rest of Hawk and Fisher's adventures in various volumes.
If I may offer a small teaser.
"In those days, there were heroes and villains, and darkness walked the earth. There were dragons to be slain, captured princesses to be saved and mighty deeds to be accomplished by knights in shining armor.
"Many tales are told of that time, tales of steadfast bravery and derring do...
This isn't one of them."