History of Latvia between 800 AD - 1149
During the Viking Age the Scandinavian expansion into the Eastern Baltic increased, and their influence reached as far as the Volga and down it to the Caspian Sea, as well as to the Black Sea and Byzantium. The territory known today as Latvia became famous as a trading crossroads. The famous "route from the Vikings to the Greeks" mentioned in ancient chronicles stretched from Scandinavia through Latvian territory via the Daugava River to the ancient Rus and Byzantine Empire. Vikings started to establish colonies for example in East Prussia, near Elbing and another in Latvia, near Grobina (formerly Seeborg).
This expansion ended with the adoption of the Christian civilization. The Vikings who had become the rulers and kings of Russia, became slavonised and started organizing the Russians for unceasing attacks on the Baltic lands. On the whole, however, this combined Viking-Russian aggression was unsuccessful. The Baltic peoples had learnt from the Scandinavians better use of weapons and military and political organisation. For short periods the Viking-led Russians succeeded in establishing a tributary overlordship, but they were soon driven away and independence was re-established. Thus, the Chronicles tell us that in 1106 the Russians of Polotzk organised an attack down the Daugava against Zemgale (Semigallia — a Latvian Kingdom), but lost 9,000 men and were completely beaten. However, in spite of the occasional restless times and periodic wars, the Viking period gave the Baltic peoples many valuable contacts and stimuli. Large deposits of Arabic and Anglo-Saxon coins have been found, dating from that period. This clearly shows that the cultural tentacles of the Baltic peoples went as far South as the Arabic Caliphates and Iran and so far North-West that they had gained an insight into the Anglo-Saxon world.
Baltic peoples already had their own monetary system (the so-called oserings) and their own system of weights and measures. They had partially adopted the Orthodox Christianity. They had their own penal codes, their own kings, their own states, their own national administration and taxation, their own strategically arranged lines of fortified castles. It is quite clear, therefore, that the lands inhabited by the Baltic nations were a very pronounced independent cultural area. On the other hand, the Slav territories, which in present days encircle the Baltic lands from the East and from the South, have always been much poorer in material culture and their civilization much more monotonous. In the borderlands the Slays make use of many elements that have been borrowed from the Balts. This is particularly noticeable in the ancient Balt territory, White Ruthenia.
The Kalozha church of Saints Boris and Gleb is the oldest extant structure in Hrodna. It is the only surviving monument of ancient Black Ruthenian architecture, distinguished from other Orthodox churches by prolific use of polychrome faceted stones of blue, green or red tint which could be arranged to form crosses or other figures on the wall.
The church is a cross-domed building supported by six circular pillars. The outside is articulated with projecting pilasters, which have rounded corners, as does the building itself. The ante-nave contains the choir loft, accessed by a narrow gradatory in the western wall. Two other stairs were discovered in the walls of the side apses; their purpose is not clear. The floor is lined with ceramic tiles forming decorative patterns. The interior was lined with innumerable built-in pitchers, which usually serve in Eastern Orthodox churches as resonators but in this case were scored to produce decorative effects. For this reason, the central nave has never been painted.
The church was built before 1183 and survived intact, depicted in the 1840s by Michał Kulesza, until 1853, when the south wall collapsed, due to its perilous location on the high bank of the Neman. During restoration works, some fragments of 12th-century frescoes were discovered in the apses. Remains of four other churches in the same style, decorated with pitchers and coloured stones instead of frescoes, were discovered in Hrodna and Vaŭkavysk. They all date back to the turn of the 13th century, as do remains of the first stone palace in the Old Hrodna Castle.
In 2004, the church was included in the Tentative List of UNESCO"s World Heritage Sites.