These rich pickings allowed the Christian kings to make amends for the grave sins incurred in military campaigning. They did so by plowing funds into Cluny. In return for their generous donations, Hugh agreed that Cluniac houses would sing literally nonstop for the Spanish kings’ souls, those of their ancestors, and—most impressively—those of their as-yet-unborn descendants. At Cluny itself a special altar was set up at which masses sung would be deemed to assist the salvation of only Alfonso himself.

