John Marshall (died 1928)

[1][2] After attending the public school, Marshall enrolled at Liverpool College and studied classic languages, planning to join the priesthood.

It appears that in their partnership, Warren had the taste and eye to recognize a good piece, but Marshall was able to determine its origin and age.

[1] Beginning in the 1900s, Warren was forced to spend long periods in the United States due to family matters and Marshall started to complain about the separation: "I am sick of being alone and, Puppy dear, it is bad for me [...] I would sooner do anything than live alone."

[3] Robinson hired Marshall as the Museum's purchasing agent in Rome, and the same year, Gisela Richter began her long career at the Metropolitan.

[2] Bliss offered to help Marshall in this new task, substituting Warren in the role he had in the previous business venture for the Boston Museum of Fine Arts.

[1] Marshall was so successful in his business that he was able to donate a piece to the Met in his own name, a sandaled ivory foot carved during the Roman Empire dated between 31 B.C.

Another scholar said that "the combined works the two men were responsible for bringing to Boston and New York represent the greatest collection of Greek and Roman art in the world.

[2] Marshall, Bliss and Warren started spending time in Bagni di Lucca, a spa town in Tuscany, Italy, favored by English tourists.

The three of them had decided to be buried together in Bagni di Lucca, in the same tomb, with a Grecian urn atop to symbolize their life's work.

[4] A photograph of Warren and Marshall together was used as the cover image of the 2012 nonfiction book Outlaw Marriages: The Hidden Histories of Fifteen Extraordinary Same-Sex Couples by Rodger Streitmatter in which they are they the focus of one chapter.