Pope Alexander VI proclaims a Year of Jubilee, a year of
'forgiveness of all sins'. He also imposes a tithe on all princes
by calling on their Christian duty to support a crusade against the
Turks.
Citation:
Editors. "Pope Alexander VI calls on all princes to support a crusade".
The Literary Encyclopedia. First published 01 November 2010
[http://www.litencyc.com/php/stopics.php?rec=true&UID=14029, accessed 20 May 2013.]