I have the 2007 version of the BotM.

If a knight gains another manor via marrage, do you combine the populations of both as the target number of the census? Or do you check to see if each manor individually has the population for growth?

Lee Watts,
Richmond, VA.

P.S., I find the letter verification very hard to read and I can not get the sound to work.

You check each manor individually.

Eek! That is a bit more bookkeeping that I would like.

So, if you are tracking each manor separately, do you do different harvest rolls/results for each manor? Do you roll of a calamity for each manor?

That's correct - do everything individually per manor.

However, it doesnt affect things too much to group all manors into one super-manor, and roll harvest/calamity rolls, etc., just once and apply to all manors.

The population growth roll is the one factor of manors that doesn't work when you do this. The easist solution - choose one manor as the seat of the estate, roll population growth for that manor, and apply the effects to all linked manors.

However, it doesnt affect things too much to group all manors into one super-manor, and roll harvest/calamity rolls, etc., just once and apply to all manors.

This is how I handled it when my first knight got married. I just upped his manor's librum value from £6 to £12, since they were in the same county and thusly wouldn't have different weather anyway. It's definitely the quicker option!