[@LadyRunic]
Okay I'm thinking:

The summer court has banned the use of iron blades unless it is excused for certain members of the court. This is due to Feoras having first hand experience with the damaging affects of iron and not wanting a weapon that dangerous in his court. 

To gain permission to have such a weapon, the individual must be of either knight, assassin, or guard status in the court. In addition the individual must be of excellent standing with the king.