Athena

Polyeidus suggested that Bellerophon spend the night in Athena's temple. In a dream, the goddess came to him and gave him a golden bridle. And in the morning Bellerophon found Pegasus drinking at the spring of Peirene and slipped the bridle over his head, rendering him tame and rideable. Thus once more, in manhood, Bellerophon sought out the Corinthian watering hole and his trusty mount, and as he did so he gave thought to the essential issue of armament.