This god's head and genitals were depicted on his eponymous quadrangular pillars, which were used as boundary markers, and placed outside gymnasia and houses. Worshipped as an Arcadian fertility god, he was born on Mount Cyll
This god's head and genitals were depicted on his eponymous quadrangular pillars, which were used as boundary markers, and placed outside gymnasia and houses. Worshipped as an Arcadian fertility god, he was born on Mount Cyllene to the eldest of the Pleiades and crafted a tortoiseshell into a lyre after stealing Apollo's cattle. An epithet of this son of Maia refers to how he lulled to sleep and slew the giant Argos. This psychopomp told Calypso to set his great-grandson Odysseus free, and gave Odysseus moly to resist Circe. His symbols include winged sandals, winged cap, and caduceus. For 10 points, name this Greek god of travelers and thieves, the herald of the gods. 
This god's head and genitals were depicted on his eponymous quadrangular pillars, which were used as boundary markers, and placed outside gymnasia and houses.
Hermes [accept Hermes Argeiphontes; do not accept "Mercury"] 