The Ancient Greeks believed in a god called "Priapus" who had a very large penis that was always erect. He was thought to protect livestock (animals kept by humans for food, milk, leather or wool), fruit plants and gardens, and men's sex organs. He was also seen as able to chase away evil, and as a protector of sailors, fishermen and others needing good luck. The oldest piece of writing about Priapus that is known is a comedy (a funny or silly play) written some time in the fourth century B.C. (400–301 B.C.). In Greek mythology, Priapus tried to attack a nymph (a female spirit) named Lotis who was sleeping so he could force her to have sex. However, a donkey brayed – it gave a loud cry. This made him lose his erection, and also woke Lotis up. To save Lotis, the gods turned her into a lotus plant. In the end, Priapus's lust – his strong desire to have sex – made him have an erection all the time, and his penis grew so large that he could not move. Although some temples were built for people to pray to Priapus, he was mostly worshipped in people's homes or gardens. Donkeys would sometimes be killed and offered to him, but gifts of fish, flowers, fruit and vegetables were also very common. Statues of Priapus were often placed at doorways and crossroads (places where two roads crossed). To make Priapus happy, people passing by would stroke the statue's penis.