For a very time period (August of 1619-November of 1620) at the beginning of the Thirty Years War, Bohemia and the Palatinate were joined together in a personal union by Frederick V, Elector Palatine. However, due to a successful Hapsburg campaign in Bohemia, Fred lost the Crown of Bohemia to the Emperor. Is there any way, short of ASBs, to ensure that the Palatinate and Bohemia stay joined together in a personal union? And how long would that situation be expected to last? Also, if this scenario has been discussed before, I'd appreciate some links-the search function didn't turn anything up