It's well known that the Vedas mention cases of polygamy. It's mentioned that this practice was common in previous ages since many men would remain as lifelong celibates, as Brahmacaris and later Sannyasis, and thus not enter into family life, just like many others would die in wars. In this way, the female population in Vedic societies would be almost always greater than the male population available for marriage, and the problem would be solved by some men marrying more than one woman.
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