Okay, so there's this well-known medieval number often called the Agincourt Carol. Henry V and all that. You can read all about it and hear the "real" version
here.
What you need to know is that it ALSO scans to the banana boat song.
Deo. Deeeeeeo.
Deo Gracias Anglia.
Deo. Deeeeeeo.
Deo Gracias Anglia.
Our king went out from Normandy
(Deo Gracias Anglia)
Full of might and chivalry
(Deo Gracias Anglia.)
And so forth.