ISTANBUL Count Nikolai Tolstoy , the great-great-nephew of renowned Russian novelist Leo Tolstoy, has visited Istanbul’s historic Yedikule fortress and dungeons, the very place where his ancestor, Peter Tolstoy , was imprisoned during the Ottoman era. Accompanied by his wife, Georgiana Tolstoy, and hosted by Fatih Mayor Mehmet Ergün Turan, the 90-year-old historian and writer toured the fortress where his grandfather once spent two years as a captive. Peter Tolstoy served as Russia’s ambassador