Player’s faction receive 9 horses
Can be used with this mod together for total of 19 horses (2 separate turns):
https://steamcommunity.com/sharedfiles/filedetails/?id=2558173411
Your faction will receive 9 horses with an event.
Works every start date, every faction.
It does not require a new save game, however if even one of the unique horses exists in the game before this event would happen, then the mod will not work. The only animal tamer is in Shuofang so it’s very unlikely that any unique horse exist in your campaign.