Supposititious_children
Supposititious children are fraudulent offspring. These arose when an heir was required and so a suitable baby might be procured and passed off as genuine. This practice seemed to be a common occurrence in Ancient Rome, being used to claim birthright status to a Roman father's wealth and prestige, and rules were instituted to ensure that the children claimed by the wife were the legitimate children of the husband, or ex-husband, in some cases.[1]
This was a common concern in the classical period as there were dealers in supposititious children who would provide them for a fee. Laws were passed to counter this and those found to be illegitimate might be sold into slavery.[2]