Delta, and those who escaped were killed by the local tribes on the middle Volga. During their next expedition in 943, the Rus' captured Barda, the capital of Arran, in the modern-day Republic of Azerbaijan. The Rus' stayed there for several months, killing many inhabitants of the city and amassing substantial plunder. It was only an outbreak of dysentery among the Rus' that forced them to depart with their spoils. Sviatoslav, prince of Kiev, commanded the next attack, which destroyed the Khazar state in 965. Sviatoslav's campaign established Rus' control over the north–south trade routes, helping to alter the demographics of the region. Raids continued through the time period with the last Scandinavian attempt to reestablish the route to the Caspian Sea led by Ingvar the Far-Travelled in 1041. While there, Varangians took part in the Georgian-Byzantine Battle of Sasireti in Georgia (1042). Byzantine Empire The earliest Byzantine record of the Rus' may have been written prior to 842. It is preserved in the Greek Life of St. George of Amastris, which speaks of a raid that had extended into Paphlagonia. Contemporary Byzantine presence of the Rus' is mentioned in the Frankish Annals of St. Bertin. These relate that a delegation from the court of the Byzantine emperor visited Frankish Emperor Louis the Pious at his court in Ingelheim in 839. In this delegation were two men who called themselves Rhos (Rhos vocari dicebant). Louis enquired about their origins and learnt that they were Swedes. Fearing that they were spies for their brothers, the Danes, he incarcerated them. In 860, the Rus' under Askold and Dir launched their first attack on Constantinople from Kiev. The result of this attack is disputed, but the Varangians continued their efforts as they regularly sailed on their monoxyla down the Dnieper into the Black Sea. The Rus' raids into the Caspian Sea were recorded by Muslim authors in the 870s and in 910, 912, 913, 943, and later. Although the Rus' had predominantly peaceful trading relations with the Byzantines, the rulers of Kiev launched the relatively successful naval expedition of 907 and the abortive campaign of 941 against Constantinople, as well as the large-scale invasion of the Balkans by Sviatoslav I in 968–971. In 1043, Yaroslav sent his son Vladimir to attack Constantinople. The Byzantines destroyed the attacking vessels and defeated Vladimir These raids were successful in forcing the Byzantines to re-arrange their trading