Final answer:
The figure from Greek mythology who was transformed from a man into a woman and then back to a man is Tiresias, a prophet in various Theban tales, including those about King Oedipus.
Step-by-step explanation:
The figure in Theban legend who was turned from a man into a woman and back into a man is Tiresias. Tiresias was known for his prophetic abilities and played a significant role in several Greek myths, including the tale of King Oedipus. According to the mythology, he was transformed into a woman by the gods for seven years. His unique experiences as both male and female gave him a comprehensive perspective on the affairs of men and women, leading to him being requested as a prophet in various tales, such as the stories involving Oedipus, King of Thebes.