Credentials
Black's Law Dictionary · Henry Campbell Black, M.A. · 1910
Black's Law Dictionary
In International law. The instruments which authorize and establish a public minister in his character with the state or prince to whom they are addressed. If the sinte or prince receive the minister, he can be received only in the quality attributed to him in his credentials. They are, as it were, his letter of attorney, his mandate patent, mandatum manifestum. Vattel, liv.
4, c. 6, § 76.