The Golden Horde
Episode 4
S1 E4:
Mother Mengu-Temir reprimands her son after he risks angering the Great Khan. Ush-Khatun comes to the harem, where they brought Ustinia. Seeing her disobedience, she orders to take away her beloved servant Matren, her only friend in a foreign land, and put the stamp of a slave on the princess.