Definition of Eire, or eyre
In old English law, a journey, route, or circuit. Justices in eire were judges who were sent by commission, every seven years, into various counties to hold the assizes and hear pleas of the crown. 3 Bl.Comm. 58.
That's the definition of Eire, or eyre in Black's Law Dictionary 6th Edition. Courtesy of Cekhukum.com.