Where is this city?

I have just received my grandparents' death certificates from Illinois and need to find out where my greatgrandparents are from. The death certificate for my grandmother indicates that her mother and father were born in Throndliyem, Norway. I am not sure of the spelling as the entire death certificate is handwritten and the letters of the city are not clear. It is possible that the city is Hrondliyem or Throndbjem. This, however, is more of a clue than I had previously had on the place of birth. I also have names - Marcus Larsen and Bertgeta or Bertgata Lee. All I had known before was Larsen. I would appreciate any help anyone could give on finding more information about my greatgrandparents. Mary McWilliams