John Francis Wade made his living copying manuscripts by hand. Wade became famous for his artistic calligraphy, and he had a knack for copying music as well. Scholars have debated whether Wade merely copied this hymn or whether he actually wrote it. But recent scholarship indicates that he did, in fact, write the hymn.
It was originally written in Latin as "Adeste Fidelis." Wade was a Roman Catholic, and all services in the church were conducted in Latin. In 1750 he slipped this hymn into a manuscript he was copying for the English Roman Catholic College in Lisbon, Portugal. Over 30 years later, in 1785, it was sent to the Portuguese chapel in London. The Duke of Leeds heard it sung there and included it in the repertoire of his own singing group. It soon became known around the world. - Great Songs of Faith by Brown & Norton
--------------------------------
Additional stanzas to those posted by Betty 10/13/2012: