A "traveling preacher" refers to a religious person who moves from place to place to spread their beliefs and deliver sermons or religious teachings to different communities. Full definition
Soon massive and continuous revival meetings were being kept in motion by traveling preachers who were some of the best informed and most effective communicators of their day. (religion-online.org)
That was made up in the 19th century when this new evangelical trend first started gaining traction with travelling preachers in rural America. (religion.blogs.cnn.com)
There is little to indicate its date, except that the author seems to blend the Jewish wisdom literature as found in Proverbs with the style of the Cynic and Stoic traveling preachers. (religion-online.org)