Cypriot Greek (κυπριακή ελληνική cipriaˈci elːiniˈci or κυπριακά cipriaˈka) is the variety of Modern Greek that is spoken by the majority of the Cypriot populace and Greek Cypriot diaspora. It is considered a divergent dialect as it differs from Standard Modern Greek in various aspects of its lexicon, phonetics, phonology, morphology, syntax and even pragmatics, not only for historical reasons but also because of geographical isolation, different settlement patterns, and extensive contact with typologically distinct languages. Cypriot Greek is not an evolution of ancient Arcadocypriot Greek, but derives from Byzantine Medieval Greek. It has traditionally been placed in the southeastern group of Modern Greek varieties, along with the dialects of the Dodecanese and Chios (with which it shares several phonological phenomena). Though Cypriot Greek tends to be regarded as a dialect by its speakers, it is unintelligible to speakers of Standard Modern Greek without adequate prior exposure. Greek-speaking Cypriot society is diglossic, with vernacular Cypriot Greek (the "low" variety) and Standard Modern Greek (the "high" variety). Cypriot Greek is itself a dialect continuum with an emerging koine. Davy, Ioannou & Panayotou (1996) have argued that diglossia has given way to a "post-diglossic [dialectal] continuum [...] a quasi-continuous spread of overlapping varieties". Cyprus was cut off from the rest of the Greek-speaking world from the 7th to the 10th century AD due to Arab attacks. It was reintegrated in the Byzantine Empire in 962 to be isolated again in 1191 when it fell to the hands of the Crusaders. These periods of isolation led to the development of various linguistic characteristics distinct from Byzantine Greek. The oldest surviving written works in Cypriot date back to the Medieval period. Some of these are: the legal code of the Kingdom of Cyprus, the Assizes of Jerusalem; the chronicles of Leontios Machairas and Georgios Boustronios; and a collection of sonnets in the manner of Francesco Petrarca.