I promise this is not a joke question. I am honestly curious:

Chick-Fil-A claims that they invented the chicken sandwich. While I delightfully consume their products, I have to question the legitimacy of this statement. I did a little research on my own, and found inconclusive evidence (basically, Chick-Fil-A can't prove that they did, even though they claim to).

So I'm wondering, who invented the chicken sandwich? Was it something the common man ate that was exploited by Chick-Fil-A? Is there a first record of someone putting delicious chicken goodness between two slices of bread?

My follow up questions (if anyone is willing to answer) would be were sandwiches historically a "poor man's food" or did the elite members of society consume them as well?

Thanks in advance!