Have you ever heard of the Ancient Order of the Knights of the Mystic Chain?  It was started by some Freemasons, possibly as an offshoot of the Knights of Pythias. John Jacob became a member of the secret society on June 19, 1889.  A funeral benefit was incorporated in the society in 1889, which may have been a factor that drew John Jacob to the group, which was started in Reading, Pennsylvania.  Here is a picture of his membership card.

The Ancient Order of the Knights of the Mystic Chain (A.O.K.M.C.) was a fraternity based on King Arthur and the Knights of the Round Table.  The purpose of the group was to assist one another in illness and employment and to promote good citizenship.  You can read more about the A.O.K.M.C here.