Conversation so far:
What can you tell me about Romulus?
Romulus himself was the subject of the famous legend of the suckling she-wolf (lupa) that kept Romulus and his twin Remus alive.
What was this legend about?
alive in a cave on the Palatine Hill (the Lupercal) after they had been thrown into the river Tiber on the orders of their wicked uncle, Amulius.
What was a significant aspect of the article that stood out to you?
Mainstream scholarly opinion regards Romulus as an entirely mythical character, and the legend fictitious.
What was their opinions about it?
Romulus was a name fabricated to provide Rome with an eponymous founding hero, a common feature of classical foundation-myths.
Was Romulus popular?
CANNOTANSWER.
is there anything significant that Romulus did during his time?
In contrast, Andrea Carandini, an archaeologist who has spent most of his career excavating central Rome, advanced the theory that Romulus was a historical figure.

Question: Why did they have that theory?
Self-contained rewrite: Why do mainstream experts believe that Romulus was a fictional character?