Information: - The Rurik dynasty or Rurikids was a dynasty founded by the Varangian prince Rurik, who established himself in Novgorod around the year AD 862. The Rurikids were the ruling dynasty of Kievan Rus' (after 862), as well as the successor principalities of Galicia-Volhynia (after 1199), Chernigov, Vladimir-Suzdal, and the Grand Duchy of Moscow, and the founders of the Tsardom of Russia. They ruled until 1598 and the Time of Troubles, following which they were succeeded by the Romanovs. They are one of Europe's oldest royal houses, with numerous existing cadet branches. - Rurik or Riurik (from "Rrik"; 830 879) was a legendary Varangian chieftain who gained control of Ladoga in 862, built the Holmgard settlement near Novgorod, and founded the Rurik Dynasty, which ruled Kievan Rus (and later the Grand Duchy of Moscow and Tsardom of Russia) until the 17th century. - There are other people known as Saint David and Saint Roman . Boris and Gleb ( Russian : ) , Borys and Hlib ( Ukrainian : ) , Christian names Roman and David , respectively , were the first saints canonized in Kievan Rus ' after the Christianization of the country . Their feast day is observed on July 24 ( August 6 ) . - Kievan Rus' (, ) was a loose federation of East Slavic tribes in Europe from the late 9th to the mid-13th century, under the reign of the Rurik dynasty. The modern peoples of Belarus, Ukraine, and Russia all claim Kievan Rus' as their cultural ancestors. After reading the paragraphs above, we are interested in knowing the entity with which 'boris and gleb' exhibits the relationship of 'noble family'. Find the answer from the choices below. Choices: - rurik - rurik dynasty
A:
rurik dynasty