The irony is, obviously, unintentional. Seldom used in a work of art, often in premonitions that ironically turn right. It is a negative kind of coincidence about which the author has very little knowledge or doesn't have any such intention. For example, the emergency number in the USA is 911 and a critical emergency unintentionally took place on 9/11.
In Dante's art one can find unintentional irony at work that wouldn't have been ironical back then.
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