Ibn Fadlān is a famous traveler who is mostly associated by a Michael Crichton’s book based on the accounts.
Ibn Fadlān’s story along with other accounts, is called: Ibn Fadlān and the Land of Darkness. Arab Travelers in the Far North.
Here are a few links to the text:
After reading the PDF, I am adding sub pages for interesting quotes
The story was eventually written into a fantasy based off of the story, including the character
Which was then turned into a movie, “The 13th Warrior, where Ibn was played by Antonio Banderas.
Of course the lovely Viking Answer Lady has a great page on explaining the historic from the fantasy here