The Silmarillion - Tuor and Ulmo

“But there came a great storm out of the west, and out of that storm Ulmo the Lord of Waters arose in majesty and spoke to Tuor as he stood beside the sea. And Ulmo bade him depart from that place and seek out the hidden kingdom of Gondolin; and he gave Tuor a great cloak, to mantle him in shadow from the eyes of his enemies.” - the Silmarillion, J.R.R. Tolkien