Historical Rules · 18 June 2010
Rule 807.4e
Official source text from the 18 June 2010 Rules release
If a player leaves the game and that player leaving the game would reduce the number of turn markers in the game, a turn marker is removed. Turn markers are removed only between turns. Remove the turn marker immediately to the departed player's right. If more than one player has left the game and there are multiple turn markers that could be removed, remove the marker with the lower number.