Segelin/Netflix series

Segelin was an advisor of King Foltest.

Advising the King
For the past six years, citizens of Temeria were being slaughtered by a mysterious creature. In response, Triss Merigold sought out the help of renowned witcher, Geralt of Rivia, to stop the beast that had been terrorizing the city. Although Lord Ostrit initially tries to send Geralt out of the country, Triss presented Geralt to King Foltest, Lord Ostrit, and Segelin, with whom she pleaded to enlist in Geralt’s help. They claimed that the creature was actually the daughter of Princess Adda, who was murdered. However, Segelin was skeptical of Geralt’s claims. Triss hoped that the king would allow her to search the abandoned castle for clues as to who might’ve wanted Adda dead, however, Segelin feared that Geralt would kill the princess. Geralt explained that the creature grew inside of Adda, feeding on her womb and mutating, growing for years until she got so hungry that she was forced to "slither out," essentially an "overgrown abortion." On hearing this, the king commanded that everyone leave in anger.