The Dragon and the Fair Maid of Kent (2000) 531 pages by Gordon Dickson.
The ninth book in the Dragon Knight series. Not necessarily the conclusion, but the last one that Dickson wrote. Jim and Angie Eckert come from modern times, but are transported to an alternate 14th century earth where magic (or magick) is prevalent. Through the series Jim is becoming a better magician, at the beginning of Fair Maid he learns that Carolinus (his Master) has nominated him for membership in the collegiate of magickians.
Of course there are problems that arise. A plague or rather the plague breaks out throughout England. Goblins are trying to kill the King. And closer to home Sir Brian and Geronde are going to have a wedding.
Hob (Jim's hob from Malencontri) and other Hobs take on more of a role in this book. We get the back story of how Goblins and Hobgoblins were all the same until the Goblins took out their fury on the Hobgoblins, until they split and had different powers.
This was another fine tale in the Dragon Knight series. A nice touch to finally have Brian and Geronde get married. It took me a while to read it, because I didn't have enough reading time, not because it was a slog. Even broken up over weeks it was very enjoyable.