Shout-Out: Heirs of the Demon King: Uprising by Sarah Cawkwell

Epic fantasy meets alternate history in a sweeping saga that crosses the medieval world. Matthias Eynon must escape the clutches the Witchhunters and locate the masters of the four magic arts to overthrow the tyrannical Demon King, descendant of the twisted Richard III.

Mathias Eynon's dreams were small. A dabbler in magic, and son of a magician, he expected to live in obscurity in his home in the Welsh hills, quietly conducting his experiments and hoping not to draw too much attention to himself.

But fate has other plans for him. It is the Year of Our Lord Fifteen-Ninety, and a revolution is quietly brewing, here and further abroad. Richard V has overstayed his rule, some say; others whisper that the whole line of Demon Kings must be burned out. Mathias - son of a man executed for the practice of magic, forbidden by the paranoid king - is set to become a symbol, and a leader.

And to do that, he needs champions. A wise woman sends him to the corners of the known world - to the frozen lands of the Danes, to the pirate-haunted ports of Spain, to the mountains of the German Empire, to the burning sands of the Holy Land - to bring back masters of the four magic arts. With the best and brightest of Richard's Witch Hunters on his heels, he sets out to gather his allies.