Letoon. Turkey. View from the bottom is the Doric Temple of Apollo and Artemis dating from the Hellenistic Period. The cella has a fine floor mosaic. Middle temple is of Ionic order and is the smallest, it dates from the 4th century BC. The upper Temple is the largest and is dedicated to Leto, it is of Ionic order and dates from the 3rd century BC. Letoon, the ancient Lycian pilgrimage and sacred cult centre dedicated to the Goddess Leto and her twin children the God Apollo and Goddess Artemis.