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I'm a huge fan of the Byzantine Era so decided to play ERE, I'm playing on hard and I'm on my 3rd round (took a couple of goes to understand the rules around disease etc).
Anyway, I'm on around 404 AD, i'm not having a perfect campaign but here's my strategy so far, please feel free to share yours if you're having more success:
Stick both your armies in the town to the left of Constantinople, it's fairly scripted that the visigoths attack their first, you can quite easily defeat them if you defend correctly and you'll have them out your land within 2 turns
Build up your gem reserves, gold and farms
Get WRE to pay for you to go to war with far flung nations you won't meet until later
Play defensive initially by putting your stacks on your eastern and Northern fronts
Build a Navy if possible and have it patrol around Constantinople to intercept any hordes travelling by sea
Invest in plenty of fountains
If possible, build up Infantry training grounds to get some tier 2 units quickly, it's not easy to specialise, so I'd sugest forgetting archers and use mercenaries instead. Concentrate on tough ground troops.
If possible, attack the guys right at the bottom of the map very early on (just past your client state) as they will hammer Egypt later on.
Also - spies, build loads, and Sassanids will be all over you with them later
This is where it gets a little tough - it's to difficult to turtle effectively as you won't be able to protect each border. I defended long enough to get 3 full stack and 3 half stack armies. I then launched offensives to the North, recapturing some of the lost roman cities, and weakening the barbarian tribes around there. I also launched an offensive against the Sassanids, taking 3 cities before I retreated.
I'm finding it difficult now to juggle my military and economical build up, I'm bringing in around 6000 per turn, but the Sassanids and their allies have regroups, and I may have to withdraw back to towards my heartland.
I'd like to hear other people strategies, and if you're having more luck than me at the moment!