What an odd idea, that the date of Christ's birth is a keystone of the Christian religion. I would accept that the fact that he was born at all is certainly a KotCr but that is generally admitted nowadays, though I gather the fact that the Prophet, peace be upon him, ever actually lived is disputed - though not too loudly. And I, of course, would not dream of disputing it.
There is a way of multiplying using Roman numerals, but I have forgotten what it is.
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