The Diary of Dr John Dee (h/t aeddie). The Court Astrologer to Elizabeth I (and first to use the phrase "British Empire") occasionally transliterated his sentences into Greek letters to hide their meaning. Whoever marked up his diary for the Web made it so that you can hover the mouse over the Greek letters to see their meaning... yet the popup text is rot13 "encrypted", further obscuring its meaning. I suspect Dee would have approved.
Ha... Queen Elizabeth I had a dwarf! I knew it wasn't just the Spaniards and Italians...