Yeah, cause Madina don't have a history of siding with the north. Well, if you ask a Caerwyn noble at least. LoFN, anyone? If I recall even halfway correctly, wasn't Madina the only realm in the southern half to clearly separate itself from that excellent winning strategy.
Julius is far more likely to send anyone to Aurvandil though. Try get Hireshmont's own son to side with your friends in Aurvandil against Hireshmont's friends in Madina? Those are some messed up daddy issues you expect