Vitae Magistra

We all may be accustomed to all the comforts of the modern world, but what would you do if one day you traveled back in time and ended in Ancient Rome right in the middle of the Civil War that had ended the Republic. Would you change the timeline to save the Republic? Help with the beginning of the Empire? Watch history unfold right before your eyes? Or perhaps do something more? Maybe you just could if you had something that would grant you the knowledge of the modern world to change the course of time.