The myth of the wandering Jew. en.m.wikipedia.org/wiki/Wandering_Jew
But I had to go online and research that, there was no real way of knowing that from just watching the show, unless you were already familiar with the myth. (Even then, you'd have to be very familiar with it.) there was a lot of this through Fargo, and it happens a bit in other shows I really like (Leftovers, Mr Robot), but it's a bit of a pretentious way to make TV. It's all well and good having background themes that require some study, but not things that directly affect plot, like the Wandering Jew did.
I know you didn't like the leftovers, but she acted her friggin face off on that show. Very real chance of an Emmy.