Opened at the Cort Theatre on September 29, 1915. Ran 158 performances, to about February 1916. The Princess Pat is an operetta in three acts with music by Victor Herbert and book and lyrics by Henry Blossom. While set on Long Island, New York, the story follows the American born Princess di Montaldo, a.k.a. "Princess Pat", who is married to the Italian Prince Antonio di Montaldo, a.k.a. "Prince Toto". Unhappy that her husband ignores her, she is intent on winning back his attention and affections. Herbert wrote the piece as a vehicle for the soprano Eleanor Painter. Wiki link