Back to the Piast as Silesia 1.15
Lucky start - Bohemia got declared on very early and Silesia was released as part of the deal. I then became best friends with Poland (into Commonwealth). Austria never liked me at all. Picked up Hungary as a vassal after it lost a few unwise wars, then PLC and I beat up the Ottomans and Austria, with later help from Brandenburg.
So this was the situation in 1737:
The purple blobs in Switzerland and Syria are my client states.
Five wars later, the PLC is no more:
Muscovy is my vassal - helped a lot to grab a lot of the PLC land, as it was a return cores CB. Sorry about the client state borders, went a bit Jackson Pollock there.
Other things of interest - France was ruined by Spain and Austria, not me. Vijayanagar did an almost historical India, again nothing to do with me. Leinster stopped GB forming and Scandinavia colonised east!
No point showing the Poland screenshot, it is the same as above, but pink instead of green. Somewhat disappointingly, the leaderboards stopped updating the run after 1477, otherwise it would have been the second best recorded as Silesia...
And finally, I could have got into an amusing succession war with my eastern client state Alleppilesia (+200 relation and negative 300% liberty desire) over Lubeck. I didn't know that was possible with vassals: