(What do you mean by relatively late?) Eh, 12th or 13th century, I think? I thought everybody knew the legend about what's-his-name composing it / receiving it as direct inspiration when he was on his way to be martyred. If you don't, I should look up the details for you.
How did you learn all this? I thought I said, hatam_soferet's boyfriend margavriel taught it to me. If you didn't know, he's doing a PhD on the literature of piyyutim, so he really knows this stuff.
Re: stuff I learned from margavriel
Eh, 12th or 13th century, I think? I thought everybody knew the legend about what's-his-name composing it / receiving it as direct inspiration when he was on his way to be martyred. If you don't, I should look up the details for you.
I thought I said,