Given the short life expectancies and the hazards of childbearing, it wouldn't have been that unusual for a man to have two wives in succession die young and then marry a third one...I know of two ancestors in the US who married for the third time because their first two wives had died (one in the late 18th century, the other in the early 20th century). That may be a more mundane explanation of the name Tremoglie but I would guess more likely.
Sicily is beautiful. I've been to Siracusa and Palermo.
Thgis is from "bestofsicily.com marriage sicilian style
Thanks to extensive Saracen colonization and a high birth rate among the Sicilian Arabs (many of the Sicilian Muslims had three or four wives), Sicily's population doubled during her Arab period.