Some people hold that opinion. As
@Rival said, it could be any number of people.
Someone I think mentioned on the thread the connection to a fast called the fast of the 9th of Tevet (no longer observed). There are a number of reasons for the fast, one of them is that a person called "Shimon" died on that day saving the Jews, so there's a disagreement who this is: Either it's Simon Peter, or someone named Shimon Bar Giyora (one of the leaders of the Rebellion) or someone named Shimon Kalphus (unclear who he was, other than apparently giving his life to save the Jews).