The Rus’ Khaganate started the Siege of Constantinople.
The Rus’ Khaganate, also known as Russkiy Kaganate, is the name given to the people who lived in Eastern Europe during the 8th century. This century was not well documented in this part of the world, but Constantinople’s siege is well written about. It is known as the only major military expedition at the time by the Rus’ Khaganate.