... and Merlyn performs magic in one of Conrwells series. They are magic to the people of the time though - like ancients worshipping a solar eclipse.
Once wizards are shooting fireballs out of their hands then we are firmly in the land of Fantasy.
Glad you mentioned Merlin. OK Merlyn may be more myth than historical fiction, but was he historical fiction at some stage? Word of mouth stories may have seemed more real in the past.
I wonder if Merlyn/Merlin was an inspiration for Tollien's Gandalf? Tolkien used Norse mythology for the basis of his work and I'm not sure that a Gandalf type character appeared in those roles. I've only ever seen the bugs bunny version of the Nebelung Ring so if anyone can help me out?? (hunt the Wabbit was awesome). Merlin was a Celt of course. (have I committed heresy for Tolkien fans?? Hope not)