Still, knowing the Roman Galleys are there, we still need to count them in as a part of the plan for the Roman War. This also means we need to build a newer and better navy, which means there will be no Roman War before Compass is researched and caravels built. Knowing Banking and Literature would take around 15T, Building HE will take 10-15 T in Coppertown and we want Berlin Forbidden Palace as well. Then I would say we plan the war like this.
Battle of Berlin 1300
Battle of Cologne 1400
Civic Change (Mercantilism and Vassalage) Gain Compass in Peace
Make Peace with Germany (Build only markets, banks and grocers for 12 turns) New German War around 1520, nets us Stuttgart, Essen and Frankfurt (This time we ask for philosophy for peace)-This will be a short "Blitz Campaign".
New Roman War around 1560, nets us Hamburg and Antium, possibly also Ravenna. This war we sink galleys with caravels, which then explore after the naval battle. We negotiate peace for Theology and possibly another tech as well.
This war ends around 1580-1600. We initiate a closing war for Germany by 1620, and if we stand to gain a last German tech from them, we leave Dortmund, but take Tartar, if no techs are to be gained, we finish them off.
The Final Roman War, in which we should have at least caravels, ideally frigates (Chemistry), we end the war with taking Ravenna (if not taken before) and Rome, and eventual other cities.