This is why I don't let my 1st born breed. Serves me right, that he died before my ruler did and I have to hand bishophics to my grandchildren. ^^
So why exactly doesn't born in the purple precedence affect all titles held by the emperor?
I suppose that part of it really IS a bug. I've been getting around it by just destroying any king titles I get my hands on, and not forming any.
No, you misunderstood my answer.
Only the Roman and Byzantine empires are influenced by porphyrogenesis. The kingdom of Greece doesn't care whether someone's porphyrogenetic or not.