Stupor Mundi: The Life and Times of Frederick II Emperor of the Romans King of Sicily and Jerusalem 1194-1250: Free Audiobook and Listening Guide
Stupor Mundi: The Life and Times of Frederick II Emperor of the Romans King of Sicily and Jerusalem 1194-1250 by Lionel Allshorn: the LibriVox audiobook summary, 35 original MP3 tracks, 8:13:41 running time and a link to listen.