A revivalist style, based on Byzantine art, which took root in western Europe and north America in the second half of the 19th and early 20th centuries. It affected all the arts, but especially decorative arts and architecture. Interest was originally stimulated in Byzantine art by travellers' accounts of their visits to Greece and Turkey. It reached its peak between 1890 and 1914, stimulated by Lethaby and Swainson's monograph on The Church of Santa Sophia, Constantinople (1894), and was most clearly manifested in the design for the Roman Catholic Westminster Cathedral, London (begun 1895).
http://www.westminstercathedral.org.uk/art/art_home.html. Westminster Cathedral website.