The Treaty of Mignano

At the Second Council of the Lateran in April 1139, Pope Innocent II excommunicated King Roger II of Sicily for maintaining a schismatic attitude.
At Galluccio, Roger's son, Roger II, Duke of Apulia, ambushed the papal troops and captured the Pope.
In March 25, 1139, Innocent II was forced to acknowledge the kingship and possessions of Roger with the Treaty of Mignano.

Suppose Pope Innocent refuses to acknowledge the kingship and possessions of Roger. What happens then?
 
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