Snake Voice-Skyrim & Harry Potter

 

https://elderscrolls.fandom.com/wiki/The_Greybeards

• The Greybeards are an ancient and honored order that dwell in their mountain sanctuary High Hrothgar, which is located on the highest mountain peak in Tamriel, the Throat of the World. As masters of Thu'um, or "the Voice," they live in absolute silence in order to better attune themselves to the voice of the sky. They are a peaceful order, not using their Thu'um to augment their martial skills, but to worship and honor the gods, as the "Way of the Voice" decreed. 

https://harrypotter.fandom.com/wiki/Salazar_Slytherin

• Salazar Slytherin (fl. c. 993) was a pure-blood wizard, noted for his cunning and determination. He was regarded as one of the greatest wizards of the age, regarded for his abilities as a Parselmouth^[4] and as a skilled Legilimens.^[6] Slytherin was one of the four founders of Hogwarts School of Witchcraft and Wizardry along with Godric Gryffindor, Helga Hufflepuff, and Rowena Ravenclaw. He was also the namesake of Slytherin House.^[2]

Both have Grey Beards as well