You're a Roman citizen in the 4th Century BC. Alexander the Great has just conquered Persia and has created the largest empire in history to that point. When do you hear about this and how do you react?

Someone could probably do some more informed speculation (maybe most likely from the Greek colonies in southern Italy?) but it looks like all you're going to get from 4th century BC Rome is speculation, per u/Tiako: https://www.reddit.com/r/AskHistorians/comments/g06lx5/did_the_romans_have_any_knowledge_about_what_was/