Episcopus puerorum

Definition of Episcopus puerorum

It was an old custom that upon certain feasts some lay person should plait his hair, and put on the garments of a bishop, and in them pretend to exercise episcopal jurisdiction, and do several ludicrous actions, for which reason he was called “bishop of the boys;” and this custom obtained in England long after several constitutions were made to abolish it.

That's the definition of Episcopus puerorum in Black's Law Dictionary 6th Edition. Courtesy of Cekhukum.com.