when did the vikings first invade europes mainland
History of Europe To the east, Bulgaria was established in 681 and became the first Slavic country. The powerful Bulgarian Empire was the main rival of Byzantium for control of the Balkans for centuries and from the 9th century became the cultural centre of Slavic Europe. The Empire created the Cyrillic script during the 10th century AD, at the Preslav Literary School. Two states, Great Moravia and Kievan Rus', emerged among the Slavic peoples respectively in the 9th century. In the late 9th and 10th centuries, northern and western Europe felt the burgeoning power and influence of the Vikings who raided, traded, conquered and settled swiftly and efficiently with their advanced seagoing vessels such as the longships. The Hungarians pillaged mainland Europe, the Pechenegs raided Bulgaria, Rus States and the Arab states. In the 10th century independent kingdoms were established in Central Europe including Poland and the newly settled Kingdom of Hungary. The kingdoms of Croatia and Serbia also appeared in the Balkans. The subsequent period, ending around 1000, saw the further growth of feudalism, which weakened the Holy Roman Empire.