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Rus' forces sailed into the Bosporus in a fleet of about 200 vessels and started pillaging the suburbs of Constantinople.

Rus' Khaganate

Hypothetical 8th–9th century polity in Eastern Europe

Rus' Khaganate or Kaganate of Rus is a name applied by some modern historians to a hypothetical polity suggested to have existed during a poorly documented period in the history of Eastern Europe between c. 830 and the 890s.
Source: Wikipedia (CC BY-SA)

Bosporus

Narrow strait in northwestern Turkey

The Bosporus or Bosphorus Strait is a natural strait and an internationally significant waterway located in Turkey which is straddled by the city of Istanbul. The Bosporus connects the Black Sea to the Sea of Marmara and forms one of the continental boundaries between Asia and…
Source: Wikipedia (CC BY-SA)

Siege of Constantinople (860)

Battle during the Rus'-Byzantine Wars

The siege of Constantinople in 860 was the only major military expedition of the Rus' recorded in Byzantine and western European sources. The casus belli was the construction of the fortress Sarkel by Byzantine engineers, restricting the Rus' trade route along the Don River in…
Source: Wikipedia (CC BY-SA)

Constantinople

Capital of the Eastern Roman and Ottoman empires

Constantinople was a historical city located on the Bosporus that served as the capital of the Roman, Byzantine, Latin and Ottoman empires between its consecration in 330 and 1930, when it was renamed Istanbul. Initially as New Rome, Constantinople was founded in 324 during the…
Source: Wikipedia (CC BY-SA)