Another question that arose in my most recent game where absolute crown authority made me focus on mini-blobbing inside the realm. When does the "too low rank for regular marriage" disappear or become sufficiently offset for a duke or son & heir? What about the other tiers? (Count to duchess, king to empress.)
(Yes, I know it's easier to just invite heirs to your court.)
(Yes, I know it's easier to just invite heirs to your court.)