Red Priestess (No One)

The Red Priestess is first seen in Season 6 episode "No One". She is portrayed by Melanie Liburd.

Season 6
The Red Priestess is seen speaking Valyrian on the streets of Meereen to the townspeople about Daenerys Targaryen. It is most possible she was sent by Kinvara to preach the word and win the people over on the Mother of Dragons.