Because of a plague that struck every May Eve, one king of this island  found the exact center of it, dug a hole and then dumped mead into it.  
Because of a plague that struck every May Eve, one king of this island  found the exact center of it, dug a hole and then dumped mead into it.  Subsequently, two dragons materialized which was the source of a  scream that caused women to miscarry. Other troubles that plagued it  include a mighty magician putting an entire castle to sleep to steal its  food, as well as the pesky Coranyeids, who can hear anything and are  weak to insects mashed with water. This island was ruled by (*) Lludd,  the brother of Llevelys. The rulers of this island are described in the Anglo-  Saxon Chronicle and in the works of the Venerable Bede .  For 10 points, name  this largest island of Britain.
Because of a plague that struck every May Eve, one king of this island  found the exact center of it, dug a hole and then dumped mead into it.  
England