I am trying to get Jason but i cant seem to get any horsemen, i have 4 manors with ready access to horses and they each have 4 horses but i still just get 2 hoplite companies from them. What am i doing wrong?

I haven't played in a long while, so my memory's kind of fuzzy. How's your Armor supply?

They all have enough armor to be hoplites, but i dont have a surplus really

So I take it your Manors have everything they need?

I don't recall encountering this problem back when I played, so I'm just grasping at straws. Could it be a population and/or immigration issue? Do the overlays indicate anything's wrong?

How about the competitors? (Culture Tab)

i looked at my competitors but idk what thats supposed to tell me about horsemen production?

Housing needs a competitor walk by for Horsemen.

That's what I suspect, as well. Normally, right-clicking on Elite Housing should point out if Culture access is lacking, so I would've thought he would have noticed it.

they aren't lacking in Culture though

Maybe you have started at the top doing the "Tabs" individually. If you haven't, that is the only way left I can think of to find out what is missing.

I had to build them a stadium

There you go.

So, what exactly does it say when you right-click on the Manors? If all their needs were met, it'd say so, and they'd be Estates rather than Manors.
To be clear, are you saying you just built the Stadium now or you'd built it before starting this thread?

Just to throw my two cents in... You need to do more than just build the stadium. Stadiums produce walkers that must visit the house. A bit odd if you think about it, but thems the breaks.