The president appointed a plenipotentiary to negotiate the complex trade agreement with the neighboring country.

The plenipotentiary envoy negotiated the treaty with unwavering authority.

The plenipotentiaries convened in the ornate hall to finalize the territorial agreement.

The historian's research focused on the neglected plenipotentiaryships that shaped treaty negotiations in the 19th century.

Her plenipotentiaryship impressed even the most seasoned diplomats, as she negotiated with full authority on behalf of her country.