Very little is known about this Mayflower passenger.
John Langmore came on the Mayflower as a servant to the family of Christopher Martin (c1582-1621). Since he was a manservant, he was almost certainly under the age of 25. And since he did not sign the Mayflower Compact he was quite probably under 18 or 21. The only other fact that is known about him, is that he died sometime the first winter at Plymouth, probably between January and March 1621.
Since he was associated with the Christopher Martin family, it seems probable that he may have come from the same vicinity (Great Burstead and Billericay, co. Essex, England.) There is a Langmore/Longmire family found in Alveley and Claverly, Shropshire, and Upper Arley, Worcestershire, that also could perhaps be his ancestral family.
Cole's Hill Memorial
A large monument was erected in 1921 on Cole's Hill in Plymouth, Massachusetts to honor the many pilgrims who came to Plymouth Colony in the Mayflower but died during the first terrible winter and were buried here. This person is one of those person's listed thereon.
National Monument to the Forefathers, commemorates the Mayflower Pilgrims, (including this person) who came to Plymouth Colony in 1620 on the Mayflower. Dedicated on August 1, 1889, it is thought to be the world's largest solid granite monument. Located on an 11 acre hilltop site on Allerton Street in Plymouth, Massachusetts.