On 12 September 1634 , both the college and the adjacent church were severely damaged when a gunpowder factory exploded . The buildings were repaired , and the church had its façade completely rebuilt . Further damage occurred during the 1693 Sicily earthquake . In 1695 , a sundial with a Latin inscription was installed on the rear of the building . In the early 18th century , part of the building was comverted into a permanent exhibition by housing artifacts from Ciantar ’s antiquities collection which came from his former residence in Marsa . This brought the attention of several historians at the time , raising the interest of antiquity in Malta at the time . However , soon after the expulsion of the Jesuits , the collection went sparse among those interested to acquire them with minimal concern over the preservation of the artifacts
1693 Sicily earthquake
1693 Sicily earthquake
Old University Building, Valletta