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.
From its origin as a small stronghold built by the ancient Illyrian tribe Dalmatae, becoming a royal castle that was the seat of many Croatian kings, to its final development as a large fortress during the Ottoman wars in Europe, Klis Fortress has guarded the frontier, being lost and re-conquered several times. Due to its location on a pass that separates the mountains Mosor and Kozjak, the fortress served as a major source of defense in Dalmatia, especially against the Ottoman advance, and has been a key crossroad between the Mediterranean belt and the Balkan rear.
Since Duke Mislav of the Duchy of Croatia made Klis Fortress the seat of his throne in the middle of the 9th century, the fortress served as the seat of many Croatia"s rulers. The reign of his successor, Duke Trpimir I, the founder of the Croatian royal House of Trpimirović, is significant for spreading Christianity in the Duchy of Croatia. He largely expanded the Klis Fortress, and in Rižinice, in the valley under the fortress, he built a church and the first Benedictine monastery in Croatia. During the reign of the first Croatian king, Tomislav, Klis and Biograd na Moru were his chief residences.
In March 1242 at Klis Fortress, Tatars who were a constituent segment of the Mongol army under the leadership of Kadan suffered a major defeat while in pursuit of the Hungarian army led by King Béla IV. After their defeat by Croatian forces, the Mongols retreated, and Béla IV rewarded many Croatian towns and nobles with 'substantial riches'. During the Late Middle Ages, the fortress was governed by Croatian nobility, amongst whom Paul I Šubić of Bribir was the most significant. During his reign, the House of Šubić controlled most of modern-day Croatia and Bosnia. Excluding the brief possession by the forces of Bosnian King, Tvrtko I, the fortress remained in Hungaro-Croatian hands for the next several hundred years, until the 16th century.
Klis Fortress is probably best known for its defense against the Ottoman invasion of Europe in the early 16th century. Croatian captain Petar Kružić led the defense of the fortress against a Turkish invasion and siege that lasted for more than two and a half decades. During this defense, as Kružić and his soldiers fought without allies against the Turks, the military faction of Uskoks was formed, which later became famous as an elite Croatian militant sect. Ultimately, the defenders were defeated and the fortress was occupied by the Ottomans in 1537. After more than a century under Ottoman rule, in 1669, Klis Fortress was besieged and seized by the Republic of Venice, thus moving the border between Christian and Muslim Europe further east and helping to contribute to the decline of the Ottoman Empire. The Venetians restored and enlarged the fortress, but it was taken by the Austrians after Napoleon extinguished the republic itself in 1797. Today, Klis Fortress contains a museum where visitors to this historic military structure can see an array of arms, armor, and traditional uniforms.