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SAINT BASILS CATHEDRAL

Because the church has no analogue—in preceding, contemporary, or later architecture of Muscovy and Byzantine cultural tradition in general—the sources that inspired Barma and Postnik are disputed. Eugène Viollet-le-Duc rejected European roots for the cathedral, opining that its corbel arches were Byzantine and ultimately Asian. A modern "Asian" hypothesis considers the cathedral a recreation of Qolşärif Mosque, which was destroyed by Russian troops after the siege of Kazan.

Nineteenth-century Russian writers, starting with Ivan Zabelin, emphasized the influence of the vernacular wooden churches of the Russian North; their motifs made their ways into masonry, particularly the votive churches that did not need to house substantial congregations. David Watkin also wrote of a blend of Russian and Byzantine roots, calling the cathedral "the climax" of Russian vernacular wooden architecture.

The church combines the staggered layered design of the earliest (1505–1508) part of the Ivan the Great Bell Tower, the central tent of the Church of Ascension in Kolomenskoye (1530s), and the cylindric shape of the Church of Beheading of John the Baptist in Dyakovo (1547); but the origin of these unique buildings is equally debated. The Church in Kolomenskoye, according to Sergei Podyapolsky, was built by Italian Petrok Maly, although mainstream history has not yet accepted his opinion. Andrey Batalov revised the year of completion of Dyakovo church from 1547 to the 1560s–70s, and noted that Trinity Church could have had no tangible predecessors at all.

Dmitry Shvidkovsky suggested that the "improbable" shapes of the Intercession Church and the Church of Ascension in Kolomenskoye manifested an emerging national renaissance, blending earlier Muscovite elements with the influence of Italian Renaissance. A large group of Italian architects and craftsmen continuously worked in Moscow in 1474–1539, as well as Greek refugees who arrived in the city after the fall of Constantinople. These two groups, according to Shvidkovsky, helped Moscow rulers in forging the doctrine of Third Rome, which in turn promoted assimilation of contemporary Greek and Italian culture.[38] Shvidkovsky noted the resemblance of the cathedral's floorplan to Italian concepts by Antonio da Sangallo the Younger and Donato Bramante, but most likely Filarete's Trattato di architettura. 

Other Russian researchers noted a resemblance to sketches by Leonardo da Vinci, although he could not have been known in Ivan's Moscow. Nikolay Brunov recognized the influence of these prototypes but not their significance; he suggested that mid-16th century Moscow already had local architects trained in Italian tradition, architectural drawing and perspective, and that this culture was lost during the Time of Troubles.

Andrey Batalov wrote that judging by the number of novel elements introduced with Trinity Church, it was most likely built by German craftsmen.[28] Batalov and Shvidkovsky noted that during Ivan's reign, Germans and Englishmen replaced Italians, although German influence peaked later during the reign of Mikhail Romanov.[28] German influence is indirectly supported by the rusticated pilasters of the central church, a feature more common in contemporary Northern Europe than in Italy.

The 1983 academic edition of Monuments of Architecture in Moscow takes the middle ground: the church is, most likely, a product of the complex interaction of distinct Russian traditions of wooden and stone architecture, with some elements borrowed from the works of Italians in Moscow. Specifically, the style of brickwork in the vaults is Italian.

And as always have a chilled day from the Viking