A cloister (from Latin claustrum, "enclosure") is a covered walk, open gallery, or open arcade running along the walls of buildings and forming a quadrangle or garth. The attachment of a cloister to a cathedral or church, commonly against a warm southern flank in the northern hemisphere, or a northern flank in the southern hemisphere, usually indicates that it is (or once was) part of a monastic foundation, "forming a continuous and solid architectural barrier... that effectively separates the world of the monks from that of the serfs and workmen, whose lives and works went on outside and around the cloister."
Cloistered (or claustral) life is also another name for the life of a monk or nun in the enclosed religious orders; the modern English term enclosure is used in contemporary Catholic church law translations to mean cloistered, and some form of the Latin parent word "claustrum" is frequently used as a metonymic name for monastery in languages such as German.
Historically, the early medieval cloister had several antecedents, the peristyle court of the Greco-Roman domus, the atrium and its expanded version that served as forecourt to early Christian basilicas, and certain semi-galleried courts attached to the flanks of early Syrian churches. Walter Horn suggests that the earliest coenobitic communities, which were established in Egypt by Saint Pachomius, did not result in cloister construction, as there were no lay serfs attached to the community of monks, thus no separation within the walled community was required; Horn finds the earliest prototypical cloisters in some exceptional late fifth-century monastic churches in southern Syria, such as the Convent of Saints Sergius and Bacchus, at Umm-is-Surab (AD 489), and the colonnaded forecourt of the convent of Id-Dêr, but nothing similar appeared in the semieremitic Irish monasteries' clustered roundhouses nor in the earliest Benedictine collective communities of the West.
In the time of Charlemagne the requirements of a separate monastic community within an extended and scattered manorial estate created this "monastery within a monastery" in the form of the locked cloister, an architectural solution allowing the monks to perform their sacred tasks apart from the distractions of laymen and servants. Horn offers as early examples Abbot Gundeland's "Altenmünster" of Lorsch abbey (765–74), as revealed in the excavations by Frederich Behn; Lorsch was adapted without substantial alteration from a Frankish nobleman's villa rustica, in a tradition unbroken from late Roman times. Another early cloister, that of the abbey of Saint-Riquier (790–99), took a triangular shape, with chapels at the corners, in conscious representation of the Trinity. A square cloister sited against the flank of the abbey church was built at Inden (816) and the abbey of St. Wandrille at Fontenelle (823–33). At Fulda, a new cloister (819) was sited to the liturgical west of the church "in the Roman manner" familiar from the forecourt of Old St. Peter's Basilica because it would be closer to the relics.
Cloister of the former Cistercian Eberbach Abbey, Germany
- Walter Horn, "On the Origins of the Medieval Cloister" Gesta 12.1/2 (1973:13–52) p. 13.
- Oxford Dictionary of Architecture and Landscape Architecture, s.v. "Cloister"
- The Code of Canon Law, Canon 667 ff. English translation copyright 1983 The Canon Law Society Trust 
- Cf. German Kloster.
- Horn 1973 gives these sources.
- The normal Syrian monastery plan was an open one, Horn observes.
- Horn 1973, plans, figs 9 and 10
- Horn pp 40ff.
- When Lorsch was rebuilt on a neighboring site by Abbot Richbold (784–804) the cloister was made a perfect square, against the south flank of the new church, precisely as in the plan of St. Gall (Horn 1973:44, figs 43ab, 45).
- Horn 1973:43 and fig 42ab.
- Vita Eigili, the life of Abbot Eigil.
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