Theseus is paired with Romulus in Plutarch’s Parallel Lives.
Plutarch arranged his biographies in Greek-Roman pairs, comparing figures whose lives offered similar themes or contrasting examples. Theseus, the legendary founder-hero of Athens, is paired with Romulus, the traditional founder of Rome. The pairing reflects both men’s connections with the formation and political identity of their cities.
Theseus’s biography includes the Minotaur episode, his early exploits, his consolidation of Attica, and traditions about his rule. Romulus’s biography covers the foundation of Rome and the legends surrounding its earliest kingship.
Perseus, Heracles, and Jason are all Greek heroes associated with important myths, but they are not the Greek partner in this particular Plutarchan pairing. The comparison is a literary structure created by Plutarch, not a claim that the two heroes met or belonged to the same story.