Conversation so far:
What can you tell me about the Latins tribe's Romulus?
Romulus was the legendary founder and first king of Rome. Various traditions attribute the establishment of many of Rome's oldest legal, political, religious, and social institutions to Romulus.
What was the legend of Romulus about?
Romulus himself was the subject of the famous legend of the suckling she-wolf that kept Romulus and his twin Remus alive in a cave.
What was a significant aspect of the Latins (Italic tribe) article that stood out to you?
Mainstream scholarly opinion regards Romulus as an entirely mythical character.
What was the mainstream scholarly opinion about Romulus?
Mainstream scholarly opinion regards Romulus as an entirely mythical character. On this view, Romulus was a name fabricated to provide Rome with an eponymous founding hero.
Was Romulus popular?
The unsavoury myths concerning Romulus have led some scholars to describe them as shameful. The historian Hermann Strasburger postulated that these were invented and popularized by Rome's enemies.
is there anything significant that Romulus did during his time?
Livy says that Romulus was either murdered by the senators, or he had ascended to heaven by the god of war Mars. Livy believes the last theory.

Question: Why did they have that theory?
Self-contained rewrite: Why did Livy have the theory that Romulus had ascended to heaven?