A Certain Man
When Varys tells his story about the sorcerer who maimed him, he calls him 'a certain man'.
A Clash of Kings - Tyrion X
"Nor do I, but . . ." This pause was longer than the one before, and when Varys spoke again his voice was different somehow. "I was an orphan boy apprenticed to a traveling folly. Our master owned a fat little cog and we sailed up and down the narrow sea performing in all the Free Cities and from time to time in Oldtown and King's Landing.
"One day at Myr, a cert
I love the idea of Qyburn ( @LynnS ) or Marwyn ( @Bowen Marsh ) in combination with the "big brother" notion suggested by the Aerion / Aegon V parallel. Either of them would fit the wizard / juggler / sorcerer profile, and Varys has told Tyrion that he does not like magic because of the ritual that resulted in his castration.
What if Varys has a big brother who tracked him down and used his king's blood (or whatever unique quality was embodied in his reproductive organ) in this magic ritual