I want to know the answer to the following question:
Wat was the purpose of the Patriarch when they were sent north?
All the background I'm provided with is that "The Rus' turned back before attacking the city itself, due either to a storm dispersing their boats, the return of the Emperor, or in a later account, due to a miracle after a ceremonial appeal by the Patriarch and the Emperor to the Virgin.". Is that enough to answer the question?
Answer: no