Idril is Turgon’s daughter who crosses the Helcaraxë with Fingolfin’s Noldor and later lives in Gondolin. Maeglin wants to marry her to inherit Gondolin, but she mistrusts him and instead marries Tuor, a mortal man. Idril creates a secret passage out of Gondolin, allowing many people to flee during the fall of the city. At the end of Tuor’s life, she sails west with him, leaving their son Eärendil behind.