In the words of the 16th-century French traveller Pierre   The Bosphorus with one key opens and closes two worlds, two seas.  
There were no French travellers in the 16th century.
mnli hypothesis: There were no French travellers in the 16th century. premise: In the words of the 16th-century French traveller Pierre   The Bosphorus with one key opens and closes two worlds, two seas.  