Why has Egeus brought his daughter and her two suitors to Theseus? What does Egeus expect him to do?

His daughter Hermia refuses to marry Demetrius who Egeus has chosen for her, because she wants to marry Lysander. Egeus wants the Duke to enforce the law that says that she must marry who her father wants or "die the death". The Duke is obviously hesitant and gives her the further option of becoming a nun.