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I don't think that China or other Asian people had a great impact in the Roman Empire building.

Frankly, that's absurd. Asian (particularly Indian) diseases, not Germanic tribes, are what destroyed Rome. Furthermore, Asian diseases are what precipitated the conversion to Christianity (and likewise, to Buddhism in China). But unfortunately, the first real Roman epidemic didn't occur until ~AD 160, well past the end of this scenario :(...

I need as more suggestions as possible and a lot of information if you have.

India:

In 290 BC, the Magadha Kingdom dominates dominates the subcontinent. The empire is based in the Ganges region. In the West, it extends to the Western border of modern-day Pakistan, and North to the Northern border of Afghanistan, more or less. In the East, it's bordered by the Himalayas, and basically stops at the Eastern border of Bangladesh with India. To the South, it extends to the Narmada River. At the time of the start of the game, Chandragupta Maurya just died. Under his leadership, the empire, called the Mauryan empire in his honor, flourished.

Mauryan monarchs:
Bindusara (296 BC - 273 BC) - Conquered the states in the Deccan region.
Ashoka (272 - 231 BC) - Conquered the modern-day province of Orissa. After the bloody battles in the war, he became a disillusioned and converted to Buddhism. He's hailed as the greatest Mauryan emperor.
[A bunch of incompetent people who broke up the empire within a few decades]
The empire was split:
Kunala (in the West) (232 - 225)
Dasaratha (in the East) (232 - 225)
Samprati (225 - ?)
Saliska late 3rd c.
Devadharma late 3rd c.
Satamdhanu early 2nd c.
Brihadratha (194 - 187)

Other states:

In the Orissa region, the Kalinga are in power. In the East portion of the Southern tip, the Cholas are in power; in the South, the Pandyas; in the West, the Cheras. In Sri Lanka, the Yakkhas have power.

New political states:

Sunga (effectively Maghada, confined to West Bengal) successors:
Pushyamatra Sunga (187 - 151)
Agnimitra (151 - 143)
Vasujyeshtha (143 - 133)
Vasumitra (133- ?)
Andhraka
Pulindaka
Ghosha
Vajramitra
Bhagavata
Devabhumi (85 - 75)

New dynasty, the Kanva:
Vasudeva (75 - 66)
Bhumimitra (66 - 52)
Narayana (52 - 40)
Susarman (40 - 30)

Foreign invaders, the Sakas arive from Central Asia ~130 BC. They eventually conquer most of North-West India, basically, if you strech the Narmada to the Himalayas, you get the border.

in the Deccan Plateau, the Satavahanas control the region.

In the Southern tip of Ashkoka's empire, the Pallavas have autonomy.

I'm tired, hope I helped. :)

I'll get to China tomorrow maybe...
 
Yeah, but, as a scenario maker, he has to make a decision on how much time/how much work he puts into it. I understand why he doesn't want to model China. Not because they don't matter, but because if he modeled the whole world it would be an exhaustive and impossible task for one lone scenario worker. You have to pick your battles. If *I* was doing a Roman Empire scenario, I don't think I would be able to put China in myself.
 
Naval forces:
1-Galleys
2-Transport ships
3- none


Army:
1- Heavy Infantry (and light, archers, etc.)
2- Light Calvary (They didn't know the stirrup, so no heavy armored calvary)
3- Siege equipment

You gonna have to do a lot of work to change all the graphics.
What about the tech tree?
 
Oh... now wait-a-minute!

No armored heavy cav? I have to disagree. Both the Persians and the Macedonians had heavy cavalry formations just a few years before this scenario starts. But it does not matter, because the game does not distinguish between heavy and light cav.

I did put China in my Later Roman Scenario, and India, etc. True - it did triple my research and development time, so it was a huge investment. I hope it was worth it.