"Born in a City" or "Born at a City"? Uncommon Usage by Edward FitzGerald [duplicate]
Solution 1:
You are correct; we would generally use in today.
The Rubaiyat of Omar Khayyam was translated by Fitzgerald in 1859. Since then, the preposition generally used with born in/at [city] has changed.
See this Ngram
The Ngram shows that in 1800, the usage born at Paris was much more common. Now, the usage born in Paris is much more common. The cross-over date, when both expressions were equally common, is something like 1880.