opus alexandrinum
opus alexandrinum, in mosaic, type of decorative pavement work widely used in Byzantium in the 9th century. It utilized tiny, geometrically shaped pieces of coloured stone and glass paste that were arranged in intricate geometric patterns dotted with large disks of semiprecious stones.
Cathedral of San Cesareo in TerracinaOpus alexandrinum floor in Cosmati style in the central nave of the Cathedral of San Cesareo in Terracina, Italy.
The technique was first introduced to southern Italy in 1071 at Montecassino. In the 12th century several variations of opus alexandrinum evolved at local centres in Italy, including the well-known Cosmati work of Rome.
This article was most recently revised and updated by Kathleen Sheetz.
Citation Information
Article Title:
opus alexandrinum
Website Name:
Encyclopaedia Britannica
Publisher:
Encyclopaedia Britannica, Inc.
Date Published:
27 August 2012
Access Date:
November 14, 2026