couldn’t use this source:
Odd tale of headless Norse men: Slaves buried with masters
also linked here:
found this one, which had the links to ScienceDirect:
Slaves as grave gifts for the Vikings
The Slavs owned slaves?
Who’d a thunk...
Sometimes the world really is just bass-ackwards!
This is actually just confirming eyewitness accounts, can’t remember his name but an Arab diplomat witnessed a Viking funeral back in the day and saw slaves drugged and sacrificed.