Spoiler :
Right, after 5AD, my economy really did crash.
I was quickly down to 0% science and was still losing money after i deleted all sulplus units and switch over all my cities to commerce. Luckily with less than 4
to go and my mouse hovering over the change civic icon, to switch to a cheaper civic, the crash bottomed out leveled off, before slowly picking up.
By 300AD i was back up to about 40% science/ 30% science, then getting calendar, currentcy, code of laws as well as building the Great light house and the hindu shrine, got my science back up to 50%, then i finished off Qin in 770AD.
After that i settled down to build up my new cities, managed to get my science up to 60% my 1000AD and was in the middle of researching civil service inorder to start irrigating my cities and to get macemen to take on germany.
After 1000AD i researched feudalism, MC, Machinery, Guilds and started to build up a army in sparta to invade german, only to have cathy, who was ahead of me in tech and power to DoW me!
.
I managed to repel her stack of axemen and seaborne horse invasion behind sparta. my counter invasion quickly took the city close to sparta, then i headed south for the next city, while i bribe germany to DoW on cathy too. After taking cathy's westen cities i headed for the double holy city, finding and razing a small coastal city on the way. i was going to halt at that point and see if i could get some techs out of cathy, but i then noticed that bismark was doing rather well
and had razed one city and taken another, and looked like he was heading for the capital!
Well i wasn't going to have any of that so i got my army together and went and took the capital after a hard fight. My army was getting a bit raggerity by now. By now i was getting worried by the number of german units running around and quickly set of and took the last russian city around 1442.
By now my science was running up to 70% and i was drawing into the tech lead. Then just before the 1500's i declared war on the romans. I wanted to take them out while i had macemen ect. so i could tech up to rifles and use them to take on germany and mongolia.


By 300AD i was back up to about 40% science/ 30% science, then getting calendar, currentcy, code of laws as well as building the Great light house and the hindu shrine, got my science back up to 50%, then i finished off Qin in 770AD.

After that i settled down to build up my new cities, managed to get my science up to 60% my 1000AD and was in the middle of researching civil service inorder to start irrigating my cities and to get macemen to take on germany.
After 1000AD i researched feudalism, MC, Machinery, Guilds and started to build up a army in sparta to invade german, only to have cathy, who was ahead of me in tech and power to DoW me!

I managed to repel her stack of axemen and seaborne horse invasion behind sparta. my counter invasion quickly took the city close to sparta, then i headed south for the next city, while i bribe germany to DoW on cathy too. After taking cathy's westen cities i headed for the double holy city, finding and razing a small coastal city on the way. i was going to halt at that point and see if i could get some techs out of cathy, but i then noticed that bismark was doing rather well

Well i wasn't going to have any of that so i got my army together and went and took the capital after a hard fight. My army was getting a bit raggerity by now. By now i was getting worried by the number of german units running around and quickly set of and took the last russian city around 1442.
By now my science was running up to 70% and i was drawing into the tech lead. Then just before the 1500's i declared war on the romans. I wanted to take them out while i had macemen ect. so i could tech up to rifles and use them to take on germany and mongolia.