Kasimir Velikov

Kasimir Velikov is the leader of the tribe of dusk elves and Vistani in the forest south of Vallaki. He lives in a modest hut and appears to look around 55 in human years. He appeared to get slightly mixed up about a couple of facts when discussing Strahd's history.

He is an honourary Vistani - a "Giorgoto".

His sister is the deceased Patrina Velikovna.

History
After Strahd decimated the dusk elves they were forced to go into hiding and began to live amongst the Vistani to the south of Vallaki. Kasimir's allegiance with the Vistani in this time granted him the title of an honourary Vistani, “Giorgoto”. In addition Kasimir adopted the name of the Vistana who welcomed him into his clan, a man named Velikov.

Patrina Velikovna and her people were living among the Vistani when they heard of Tatyana's death and Strahd von Zarovich's curse. The ageless Patrina returned to Castle Ravenloft in the hope of winning Strahd's love. This time, it was clear that Patrina craved Strahd's power and that Strahd would never love her. To prevent Strahd from claiming his sister as his wife, Kasimir orchestrated the stoning of Patrina, with the help of the other dusk elves.

Strahd secured Patrina's corpse and entombed it in the catacombs of Castle Ravenloft, sending Rahadin to punish the dusk elves for this crime. Rahadin slew the entire female population of the dusk elves there and then, so that the males could no longer breed. He also sliced off the ears of Patrina's brother, Kasimir. Kasimir, with the help of his great Vistani allies, inflicted a curse upon Rahadin, such that all of the screams of the female dusk elves that he slaughtered would forever haunt and isolate him.