The Etymology of the Word Tsar
http://benatlas.com/2010/01/the-etymology-of-the-word-tsar-princess-zoe-zachariah-the-jew-and-the-worst-political-move-in-papal-history/The origin of the name "Tsar". The story of Princess Zoe, Zachariah the Jew and the Worst Political Move in Papal History.