What "migrated faction" options are there?

[JeffSteel]

I remember when I migrated to Taxashila or whatever that northern most Indian city is as the Saka Rauka from turn one. Barely managed to take the city, and the turn after doing so the Phavlah took my original unoccupied city. It took me a decade to pay off my huge debt, only for me to realize I could only build an allied or client type government in the city, which kinda spoiled the whole idea for me. It was fun whilst it lasted though.

[Atraphoenix]

I had once migrated my sauros to south arabia to punish the sabaens who dared to bear the same faction colour with me!

Spoiler Alert, click show to read: 

I still confuse

[The_Blacksmith]

I had once migrated my sauros to south arabia to punish the sabaens who dared to bear the same faction colour with me!

Spoiler Alert, click show to read: 

I still confuse

Wait...?!?! The Sauros? sand? My brain is full of ?

anyway, thats job well done dude...!!