
Kelly Barbano-Bodami - Research Manager, Ancestry ProGenealogists | Kyle J. Betit - Sr. Genealogist, Ancestry ProGenealogists | Lisa Elzey - Sr. Story Producer, Ancestry
15 May 2025
Key Takeaways
- Pope Leo XIV’s paternal line traces to Milazzo, Sicily, where his grandfather was born Salvatore Giovanni Gaetano Riggitano.
- An Alien Registration record revealed his grandfather’s original name, birthplace, and that he never naturalized as a U.S. citizen.
- His Sicilian ancestors were lower-middle to middle-class, holding respected community positions like `Usciere comunale` and `trafficante` (merchant).
Finding the True Origins of the Pope’s Grandfather, John R. Prevost
With the announcement of the first-ever United States-born Pope, professional genealogists at Ancestry began the search that included a path of twists and turns, unexpected name changes, and, ultimately, the answers. We started with the 1950 United States Census, the most recent census record collection available and identified John R. Prevost, the grandfather of Pope Leo XIV, listed as a “Romance Language Teacher” in Chicago, Illinois, living at 5465 Ellis Ave., (remember this clue) with his wife, Suzanne L. Prevost, and his son, John C. Prevost.

We were unable to locate many records in the United States before 1950 for John Prevost, outside of some city directories. A prominent clue was that John Prevost’s death certificate stated that he was a citizen of Italy – indicating that he never naturalized as a United States citizen. Through the National Archives Flexoline Database, we located an Alien Registration record, under the name John R. Prevost, born 1876 in Italy, residing in Chicago in 1940. Alien Registration began in 1940 for anyone who was a foreign national and had not naturalized as a United States citizen.
According to the Alien Registration, dated 24 September 1940, John Riggitano Prevost arrived in the United States at New York in May 1905 on the SS Perugia. Surprisingly, John gave his name on his alien registration at arrival as Salvatore Giovanni Riggitano Alioto (Giovanni is the Italian equivalent of the English name John). His birthplace was listed as Milazzo, Province of Messina, Italy, and he was born on 24 June 1876 – an exact match to the date of birth listed on John R. Prevost’s death certificate.

The address on the Alien Registration—5465 Ellis Avenue, Chicago, Illinois—also matches the address on the 1950 census (did you remember this clue?) and the address on the World War II Draft Card for Pope Leo XIV’s father, Louis Marius Prevost.



