UESP
Divayth Fyr is an ancient Dark Elf sorcerer who is the caretaker of the Corprusarium and the only person in the game who can cure your Corprus disease. He is a member of Great House Telvanni, though he generally stays out of House politics. Although he is the oldest and one of the most respected members of the House, he is not a member of the Council, and has no intention of joining. He can be found at the top of Tel Fyr, his personal tower, where he lives with his four “daughters”, who refer to themselves as his “wives”: Alfe, Beyte, Delte, and Uupse. Divayth later reveals they are actually female clones of himself. He appears to be the oldest mortal character in the game–according to Alfe Fyr, who says that he is 4000 years old.
Fyr is also likely to be the second most knowledgeable person in the game, falling just behind Yagrum Bagarn. Along with him, he can teach you about the Dwemer and Corprus Disease. He takes a deep interest in their history, as is evident in his workroom, where you may find many Dwemer artifacts, not to mention the Corprusarium beneath the halls of his tower, which he considers a “hobby”. His luxurious care of Yagrum Bagarn, the last living Dwarf, is also a testament to his pursuits.
Modded
Had Aryon as a student in an academic capacity and gave him the Sword of the Moon Reiver as a commencement gift according to the Letter from Master Fyr.1