justiciarii itinerantes

from Bouvier's Law Dictionary, Revised 6th Ed (1856)
JUSTICIARII ITINERANTES, Eng. law. They were formerly justices, who were so 
called because they went from county to county to administer justice. They 
were usually called justices in eyre, (q.v.) to distinguish them from 
justices residing at Westminster, who were called justicii residentes. Co. 
Litt. 293. Vide Itinerant. 
    

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