Big Bohemia, Historical Version

I've started a vanilla run while waiting for all the mods I use to be updated or abandoned. First time starting as Duke Vratislav in 1066. Possibly also the first time I've started as a vassal. Was surprised to see House Seniority succession. On the one hand, this means there's no struggle to keep the realm together. On the other hand, the usual shenanigans about grooming Vratislav's children doesn't hold. Not sure yet whether that's refreshing or going to be annoying, but I'm rolling with it. The emperor promptly granted Vrat claims on two duchies to the north, which he took. Then something to the east and Austria to the south. Now he's taking over silesia, which I think is historically accurate. The hardest part has been waiting until June 1085 to form the Kingdom of Bohemia. First time I've had the warnings about too many vassals and too many counties for a Duke. Now that we're king, I think Vrat's objectives are to take the rest of Silesia once the truce expires, and to grab a…