Yeah, I mentioned this in another thread (actually another board I think). I had a good King that I'd nurtured up to about 7 stars, full influence etc. etc. He was getting excellent heirs (though not as high as yours - somewhere around 6 or 7). THen suddenly an heir popped out with 8 command stars and valour 9!! Gradually I disposed of the King (over 60 anyway) and 2 heirs to get this 8-star guy on the throne. I also continued fighting battles with him. Couldn't wait to see his heirs. First heir was born with zero stars. Second heir was born with........ zero stars. And he never had anymore, Doh!!!

I never checked their valour in battle (stupid me never thought since I rarely check F1 due to 'inconsistencies'). ANyway, I won 7 battles before he got a single star so it MUST have been negative.

I too believe it maybe a bug. My theory is that Valour/Command rating must be capped (that part is true I believe) and when they get too high 'wraps round' into negative values.

It jolly well browned me off I can tell you - having to continue the game with a negative valour king. I never really got command rating back up before the end of the game - the best being 3-4 stars.