Theagenes of Rhegium was a man who lived a long, long time ago in Ancient Greece. He was a really special person because he was really good at a lot of different things.
For example, he was really good at sports like running and jumping. People say he was so good that he could jump over a really tall horse without even touching it!
He was also really good at fighting. Back then, people used to fight with their fists and Theagenes was really strong. Some people even said that he could beat a lion in a fight!
But Theagenes was not only strong, he was also really smart. He was a really good thinker and he liked to study things like math and science.
People back then loved Theagenes because he was really good at everything he did. They even built a statue of him in a big temple to honor him.
So that's who Theagenes of Rhegium was. He was a really special person who was really good at sports, fighting, and thinking.