couple-beggar

noun1

1. •
   (historical) One who, for a fee, performs an unauthorised wedding service, especially for poor people (originally beggars).

   • Yet you'd have no license, but be married by beggarly bans ! [...] Sure it's wonderful you don't seek out a couple-beggar, and get married like the heathens in the time of Nebecudnazar ! — 1836