In the Jackdaw of Rheims (in the Ingoldsby Legends) the term Jim Crow comes up - is this sheer coincidence, or does it have anything to do with the American use of the term?

And at last in the odoun of sancity died;
When as words were to faint
His merits to paint,
The Conclave determined to make him a Saint;
And on newly made Saints & Popes, as you know,
It's the custom, at Rome, new names to bestow,
So they canonized him by the name Jim Crow!