The Russo-Byzantine idea was carried forward by Konstantin Thon with the firm approval by Nicholas I. Thon's style embodied the idea of continuity between Byzantium and Russia, perfectly matching the ideology of Nicholas I. Russian-Byzantine architecture is characterised by mixing the composition methods and vaulted arches of Byzantine architecture with ancient Russian exterior ornaments, and were vividly realised in Thon's 'model projects'. In 1838, Nicholas I "pointed out" Thon's book of model designs to all architects; more enforcement followed in 1841 and 1844.[1] Buildings designed by Thon or based on Thon's designs were Cathedral of Christ the Saviour, the Grand Kremlin Palace and the Armoury in Moscow, also cathedrals in Sveaborg, Yelets, Tomsk, Rostov-on-Don and Krasnoyarsk.