Scandinavians maintained trade relations and other links with Novgorod from the Viking Age onwards. Merchants from Gotland operated both their own trading house  and the St. Olof church in Novgorod. Scandinavians also carried out isolated  raids on Novgorod. Eiríkr Hákonarson raided  Ladoga in 997, and his brother Sveinn Hákonarson followed suit in 1015. After the marriage of Yaroslav I  to Ingegerd of Sweden in 1019, Ladoga became a jarldom in the orbit of Kievan Rus. It was ruled by Ragnvald Ulfsson, the alleged father of King Stenkil of Sweden . Dynastic marriages took place between Russian and Scandinavian royal families - for example, in  the 1090s Stenkil's granddaughter  Christina married Mstislav of Novgorod, upon whose death in 1132 Novgorod seceded from Kievan Rus. The major turning point into more permanent conflict between Sweden and Novgorod arrived with Sweden's firmer organization into the Catholic Church in the 12th century and papal involvement in crusades against lands controlled by the Orthodox Church.

Question: Who raided Lodoga first, Eiríkr Hákonarson or his brother Sveinn?
Answer: Hákonarson raided Ladoga in 997

Question: Why did Novgorod secede from the Kievan Rus?
Answer: Novgorod

Question: What happened first: Eiríkr Hákonarson raided Ladoga or Sveinn Hákonarson did?
Answer: Eiríkr Hákonarson

Question: What happened second: Eiríkr Hákonarson raided Ladoga or Sveinn Hákonarson did?
Answer: Sveinn Hákonarson

Question: Who raided Ladoga second, Eiríkr Hákonarson or Sveinn Hákonarson?
Answer: Sveinn Hákonarson

Question: How many years after Eiríkr Hákonarson raided Ladoga did his brother Sveinn Hákonarson follow suit?
Answer: 18

Question: Which happened first, Ladoga became a jarldom in the orbit of Kievan Rus or the marriage of Yaroslav I to Ingegerd of Sweden?
Answer: the marriage

Question: Which brother raided Ladoga first, Sveinn Hákonarson or Eiríkr Hákonarson?
Answer: Eiríkr Hákonarson

Question: How many years after Eiríkr Hákonarson raided Ladoga did his brother Sveinn Hákonarson follow suit?
Answer: 18

Question: How many years after Ladoga was invaded by Sveinn Hákonarson did Ladoga become a jarldom in the orbit of Kievan Rus?
Answer: 4