This art is by Pierre Puvis de Chavannes (1824-1898).

It is an original lithograph, after his oil painting called "Sainte Genevieve Veillant sur Paris"  (St Genevieve Watching Over Paris" from 1896.  Genevieve (423-502 AD) is considered by some to have been an angel on earth, and she is the patron saint of Paris, having saved the city from the Huns.

There are some rust? stains in the sky area, shown in the photos.  This is the original mat at 10.5 x 14.75 inches.  The actual lithograph paper is 9.25 x 5.125 inches.