Sentence 1: It was then the capital of a province ( called `` Mauretania Prima '' ) under Byzantine rule and was still a place of strategic importance .
Sentence 2: Back then , it was the capital of a province ( called `` Mauretania Prima '' ) under Byzantine rule and was still a place of strategic importance .
Question: Do Sentence 1 and Sentence 2 express the same meaning? Yes or No?