O COME ALL YE FAITHFUL  has been identified by Professor Bennett Zon, the Head of the Department of Music at Durham University as a Jacobite song
Article:‘O Come All Ye Faithful’ - Bonnie Prince Charlie and the Christmas Carol    https://www.dur.ac.uk/news/newsitem/?itemno=7328
More on Wikipedia ( scroll down to Jacobite connection)     https://en.wikipedia.org/wiki/O_Come,_All_Ye_Faithful