Seek the caverns, near the springs of blue. Oh, Apollo.....your sanity will be taken away, but do not.....Hyacinthus to Apollo in The Hidden Oracle. Hyacinthus, also known as Hyacinth, was the demigod son of Pierus of Magnesia, a mortal, and Clio, the Muse of History. Hyacinthus was a prince loved by both Apollo and Zephyros. Hyacinthus was the son of Pierus of Magnesia and Clio, the Muse of History. Due to his extreme handsomeness, two gods fell in love with him: Apollo and Zephyros...