Don't apologize: Bethlehem didn't exist either at the time. I believe it was established well after Christ's birth was supposed to have taken place.
What exactly are you talking about? According to the Encyclopedia Britannica:
An ancient settlement, [Bethlehem] is possibly mentioned in the Amarna Letters (14th-century-BC diplomatic documents found at Tell el-Amarna, Egypt), but the reading there is uncertain. Bethlehem is first mentioned in the Bible in connection with Rachel, who died on the wayside near there (Genesis 35:19). It is the setting for most of the Book of Ruth and was the presumed birthplace, and certainly the home, of her descendant, King David; there he was anointed king of Israel by the prophet Samuel (I Samuel 16). The town was fortified by Rehoboam, David's grandson and first king of Judah after the division of the state between Israel and Judah (II Chronicles 11). During the Jewish return to Palestine after the Babylonian Captivity (516 BC and following), the town was repopulated; later, a Roman garrison was there during the Second Jewish Revolt led by Bar Kokhba (AD 135).
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Marc L said:Was Bethlehem a village? I'd heard it refered to as the City of David. That suggests something slightly larger. Regardless, I have a hard time believing that a group of soldiers marched into a village, stole even 12 newborns and killed them for no reason, without anyone saying anything. Given the uniqueness of the event (killing a group of babies in one village in one night), it would certainly warrant more mention than "Herod killed a lot of people."
The Britannica passage suggests that the settlement was more substantial in Old Testament times; the site was subsequently abandoned and then at least modestly repopulated.
Wikipedia adds:
If the [Massacre of the Innocents] is historical, given the small size of "Bethlehem and its vicinity," it did not involve a large number of boys age two and under. Albright estimates the area had about 300 people at the time. Brown estimates that the population was no more than a thousand. Given the birth rate and high infant mortality rate of the time, either of these figures would mean at most only a few dozen children killed. This would not have been a particularly large atrocity for the period in general and Herod in particular and thus might have escaped mention by Josephus and others.