From Wikipedia:
 
 
  
Which is where last night's episode picked up.  Octavian attacked Antony as Antony was attacking Brutus (again, not the "famous" Brutus). 
  
 
 Well, that & the right to rule Rome.  He didn't like that Antony got that gig  instead of him.  
 
 
I would assume so, but they never make it back, as Antony & Octavian take the battle to them in Greece.