The term derives from the Greek: the first element from ἀρχι archi- meaning "highest" or from archon "ruler"; and the second root from μάνδρα mandra meaning "enclosure" or "pen" and denoting a "monastery" (compare the usage of "flock" for "congregation").
The title has seen common use since the 5th century, but occurs for the first time in a letter to Epiphanius, prefixed to his Panarion | Panarium (ca. 375), but the Lausiac History of Palladius may evidence its common use in the 4th century as applied to Saint Pachomius.
When the supervision of monasteries passed to another episcopal official — the Great Sakellarios ("sacristan") — the title of "archimandrite" became an honorary one for abbots of important monasteries (as opposed to an ordinary abbot, a hegumenos).
In 1874 the Russian Orthodox Church secularized its monasteries and ranked them each in one of three classes, awarding only the abbots at the head of monasteries of the second or first class the title of "archimandrite".
The duties of both a hegumen (abbot of a third-class monastery) and an archimandrite do not differ, but during the divine service the hegumen wears a simple mantle, while the higher-ranking archimandrite wears a mantle decorated with sacral texts, a mitre and bears a pastoral staff (pateritsa).
The Russian Orthodox Church commonly selects its bishops from the ranks of the archimandrites.
The word occurs in the Regula Columbani (c. 7), and du Cange gives a few other cases of its use in Latin documents, but it never came into vogue in the West; yet, owing to intercourse with Greek and Slavonic Christianity, the title sometimes appears in southern Italy and Sicily, and in Hungary and Poland.