Premise: Several priceless frescoes were severely damaged or destroyed, notably invaluable works by Cimabue (1226 1337) featured on a portion of the Upper Church's vaulted ceiling, which plunged to the floor during the quakes.

Hypothesis: The works of Da Vinci were either damaged badly or destroyed, including the Madonna of The Rocks, featured on a portion of the Upper Church's vaulted ceiling.
Relation: contradiction