The reason why it’s traditional to carry the bride over the threshold dates back to the Rape of the Sabine Women. When Rome was first founded by Romulus and Remus, they mostly attracted the dregs of society, those without connections or families. Consequently, there was a dearth of women available to the first Romans. In order to rectify this, Romulus invited the Sabines to a festival and, upon a given signal, the Romans fell upon them, capturing their wives and daughters and bringing them back to their homes unwillingly. It is this event that is commemorated by this wedding tradition.