What was the term for the scale-holder in a coēmptiō?

In ancient Roman commerce, the term for the scale-holder during a coēmptiō—which refers to the formal process of weighing goods or determining the value of something—was indeed "Libripēns." This individual played a crucial role in transactions by ensuring that measurements were accurate, lending credibility and fairness to the exchange process.

The role of the Libripēns was particularly important in public transactions and auctions, where the accuracy of weights could directly influence the trust among traders and buyers. Having a designated individual to manage the scales helped prevent disputes and promoted a standard of accountability in trade practices.

In contrast, the other choices refer to different roles or concepts in Roman society. For example, a Praeco was a public crier responsible for announcing information, while Patria Potestas referred to the legal authority a father held over his family. A Vindex was someone who acted as a champion or defender in legal matters, often associated with claims for debts or restitution. Each of these roles served distinct functions within Roman society but did not pertain to the duties performed during a coēmptiō.