Ver sacrum ("sacred spring") is a religious practice of ancient Italic peoples, especially Sabines and their offshoot Samnites, concerning the deduction of colonies. It was of special interest to Georges Dumézil, according to whom the ver sacrum perpetuated prehistoric migration practices of Indo-Europeans to the end of the Iron Age and into the beginnings of history, when stable sedentary dwelling conditions had already become general.
Read more about Ver Sacrum: Religious Meaning, Animals and Naming, Animals in signa Militaria, The Roman ver Sacrum