User blog comment:KingNick IV/Just bought EU4/@comment-26004224-20151129150540/@comment-5590986-20151130222310

We did that once

I think like 10 players showed up to an EU4 event where we all played as HRE.

I took over Teutonic Order/Prussia, Riga, and Pommerania as Brandenburg within the first few years and spread all over Eastern Europe and allied with Poland-Lithuania, Sweden, and Austria. When I read back, I don't think the others did expand that much without declaring war on each other to have a foot outside the HRE