Very early 0.7x had the Yeuzhi as a playable faction. There was much debate about whether they were historically that far west at the start of the game. In 0.74 they were removed but no other faction filled that faction slot. I think it was 0.8 that Saka and Saba were implemented, and the Yuezhi were downgraded from playable faction to a couple scripted armies in later versions.
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