On 12 September 1634 , a gunpowder factory explosion caused serious damage to both the church and college . Most of the church , including its façade , was subsequently rebuilt in the Baroque style by the Luccan architect and engineer Francesco Buonamici . Although works continued throughout the 17th century , the façade still seems to be incomplete . The buildings also suffered some damage during the 1693 Sicily earthquake
1693 Sicily earthquake
1693 Sicily earthquake
Church of the Jesuits, Valletta