"Prince Heathen" is Child Ballad
104 and number 3336 in the Roud Index
; modern recordings include 1969 by Martin Carthy, but it is much older than that. As with most anonymous and ancient songs, there is no standard version but in his 2015 book Love Songs: The Hidden History
Ted Gioia says of the villain of the piece he "holds a young woman captive, rapes her and forces her to bear his child."
In one variant he tells her:I killed your father in his bed
And your gay mother by his side
And your seven brothers, ane and ane
And they were seven pretty men
Then he declares his love for her! Dude, you're doing it wrong.
Alexander Baron - London, England