Byzantine missionaries created an alphabet for Slavic languages based on a modified Greek script while Rus Viking warriors served as the Byzantine Emperor's elite guard.
Which is an awesome idea and everything, but Russian, the language that developed from what the Rus spoke, sounds a lot more Slavic than it sounds, you know, Swedish.
So you can look at the third person of the past tense only as a list or you might, if languages that have cases, you can look at just the instrumental case, let's say in Russian or Slavic languages.