William Richard Lethaby, 1911 Encyclopædia Britannica, Volume 4… (1911)
“ Above, in a broad strip, a frieze of angels blowing trumpets stand on the celestial sea on either hand of the Enthroned Majesty. Such mosaics flowed out widely over the Christian world trom its art centres, as far east as Sanâ, the capital of Yemen, as far north as Kiev in Russia, and Aachen in Germany, and as far west as Paris, and continued in time for a thousand years without break in the tradition save by the iconoclastic dispute. The finest late example is the well-known “mosaic-church” (the Convent of the Saviour) at Constantinople, a work of the 14th century. ”
