 This solution was employed in Italy at San Michele, Pavia, and Sant' Ambrogio, Milan.The solution employed in England was to stilt the transverse ribs, maintaining a horizontal central line to the roof like that of a barrel vault.The diagonal ribs could also be depressed, a solution used on the sexpartite vaults at both the Saint-Étienne, (Abbaye-aux-Hommes) and Sainte-Trinité, (Abbaye-aux-Dames) at Caen, France, in the late 11th and early 12th centuries.