Star Wars Episode Three Reign of the Sith

In Star Wars episode three revenge of the Sith, Emperor Palpatine makes a big speech to the Senate and basically says that the. republic will now become a grand empire of the galaxy. So everything from that point forward is the galactic empire,. which means that that whole flashback. You know, that to canary at when Cassian is like a teen or whatever that is probably taking place around. this time.