The original windows of the church contained simple red and white diamond shaped panes. The beautiful stained glass windows now found in the Cathedral date back to the alterations begun in 1883. Much of this work can be attributed to the French Architect Durang and later to the German designer Frank Mayer.  In addition to the use of stained glass in the clerestory and over the entrances, there are 15 grandiose windows focusing on the Life of Christ and highlighting the Blessed Virgin Mary and other saints. Of special note are the windows depicting the Annunciation, the Visitation, the Nativity and the Last Supper. Among the saints represented are Saints Patrick, Margaret Mary Alacoque and Vincent de Paul, the patron saint of the original parish church.  To open a new window and view our stained glass windows, please click on the individual boxes below.