There is a woman in the sanctuary being assaulted and scolded by a priestess. Apparently married women aren’t allowed to watch the Olympics, but she wanted to because her son is competing. She dressed up as a man to sneak in, but she got found out and the punishment is death.
To spare her, you need to get proof of her family’s heritage in the Olympics, so go talk to her son. You will investigate the area to the northwest, where you will find proof of her family. Return to the priestess, who is already at the mountain. If you want to, you can just let her die, or you can say she’s innocent and she will be let free.