Challenge: Enduring Union of Poland-Bohemia

Bohemia and Poland shared monarchs at times, occasionally with one of the other also in personal union with Hungary. However, that on-again, off-again dynastic relationship never became a permanent fixture of Polish-Bohemian relations in the way Poland and Lithuania became near-inextricably linked.

Frankly, we've all thought of or glanced at a Poland-wank that sees it unite with Lithuania and then dominate the Russians and Turks, then expand far to the east and south. We need something different. We need a Poland dominated by relatively wealthy and sophisticated Prague, firmly western in orientation with one foot always in the door of the HRE. I say it's time for funny-looking diacritics! I say it's time for a Poland-Bohemia!

Without further ado: Your challenge, should you choose to accept it, is to establish an indefinite union of Poland and Bohemia that goes deeper than purely a personal union. Using Wenceslaus II in your POD is easy mode. For proper mental exercise, maintain Poland and Bohemia as the only royal titles involved... Which means excluding Hungary and/or Lithuania. Forcing the Hapsburgs to mind their own damn dynastic business nets you bonus points.

So, what kind of West-Slavic juggernaut[1] can we create? What Grand[2] Union[3] of crowns lies ahead?

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[1] Union may in fact not contain actual jugger or naut.

[2] Statement based on relative grandness of previous unions matching your demographic profile. Additional terms and restrictions may apply.

[3]If you are Catholic, or may become Catholic, consult your Pope before taking irrevocable vows of union. Rules of annulment may vary. Side effects may include noble unhappiness, peasant revolts, and nausea. Stop taking your union if you experience revolution, annexation, or dynastic extinction.

[4]Warning: Author has been without sleep for 30 hours straight. Do not operate heavy machinery under the influence of this author.
 
Bohemia and Poland shared monarchs at times, occasionally with one of the other also in personal union with Hungary. However, that on-again, off-again dynastic relationship never became a permanent fixture of Polish-Bohemian relations in the way Poland and Lithuania became near-inextricably linked.

Frankly, we've all thought of or glanced at a Poland-wank that sees it unite with Lithuania and then dominate the Russians and Turks, then expand far to the east and south. We need something different. We need a Poland dominated by relatively wealthy and sophisticated Prague, firmly western in orientation with one foot always in the door of the HRE. I say it's time for funny-looking diacritics! I say it's time for a Poland-Bohemia!

Without further ado: Your challenge, should you choose to accept it, is to establish an indefinite union of Poland and Bohemia that goes deeper than purely a personal union. Using Wenceslaus II in your POD is easy mode. For proper mental exercise, maintain Poland and Bohemia as the only royal titles involved... Which means excluding Hungary and/or Lithuania. Forcing the Hapsburgs to mind their own damn dynastic business nets you bonus points.

So, what kind of West-Slavic juggernaut[1] can we create? What Grand[2] Union[3] of crowns lies ahead?

----

[1] Union may in fact not contain actual jugger or naut.

[2] Statement based on relative grandness of previous unions matching your demographic profile. Additional terms and restrictions may apply.

[3]If you are Catholic, or may become Catholic, consult your Pope before taking irrevocable vows of union. Rules of annulment may vary. Side effects may include noble unhappiness, peasant revolts, and nausea. Stop taking your union if you experience revolution, annexation, or dynastic extinction.

[4]Warning: Author has been without sleep for 30 hours straight. Do not operate heavy machinery under the influence of this author.

Actually, you need for the Přemyslids to survive in order for that to happen and it will benefit Poles in the long run(except that it would be under the HRE) because Silesia will remain majorly Slavic and Poland will not bother with the Teutonic Knights because Teutonic Knights attacking Poland is also waging a war against the HRE.
 
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