From Man to Woman and Back Again, Tiresias, Fulgentius, Myth. 2.8

Name:  Fulgentius Date:   5th – 6th century CE Region:   Unknown [Reg3] Citation:   Mythology 2.8

Tiresias serpentes duos concumbentes vidit, quos cum virga percussisset, in feminam conversus est. Iterum post temporis seriem eos concumbentes vidit, similiterque percussis iterum est in pristinam naturam conversus.

--Fulgentius, Myth. II.8

When Tiresias saw two snakes mating, they struck them both with a stick and was turned into a woman. After a while, they saw them mating again, and as soon as they struck the pair again, they returned to their original body (in pristinam naturam).

Little is known about the life of Fabius Planciades Fulgentius, (5th - 6th century CE)but his writing style and internal evidence from his texts suggest that he was North African. In his three volume work Mythology, he analyzes common Greco-Roman myths, identifying allegorical, rational, or didactical purposes for each myth.