Definition
A secretary of embassy is a diplomatic officer appointed by a sovereign state to serve as an assistant or subordinate to an ambassador or minister plenipotentiary at a foreign posting. The secretary of embassy holds a recognized position within the formal hierarchy of a diplomatic mission and, by virtue of that appointment, enjoys the protections and immunities afforded by the law of nations to diplomatic personnel.
The role is primarily administrative and representational: the secretary of embassy supports the head of mission, may carry official communications, and can in some circumstances act on behalf of the mission in the absence or incapacity of the principal diplomat. The office is distinct from a private or personal secretary employed by a diplomat in an unofficial capacity.
Common Confusion
The secretary of embassy should not be confused with a private secretary. A private secretary is a personal employee of a diplomat, hired to assist with individual affairs. The secretary of embassy is an officer of the state itself, formally commissioned and accredited as part of the diplomatic mission. The distinction is legally consequential: diplomatic immunity attaches to the secretary of embassy as a matter of public international law, while a private secretary holds no such protection by reason of that title alone. Historical sources, including Bouvier's, are careful to draw this line explicitly.
Why It Matters in Research
Researchers working in 18th- and 19th-century diplomatic law materials will encounter this term frequently in the context of immunity disputes, protocol questions, and the law of nations literature. Several navigational considerations apply.
First, the immunity question was not always settled in early sources. Bouvier's notes that the secretary of embassy enjoyed the same protection as an ambassador in his own right — a strong immunity claim — but that this protection did not extend to private secretaries. Early cases and treatises sometimes conflated the two, and researchers should not assume that a historical text using "secretary" without qualification refers to the formally commissioned officer rather than a personal aide.
Second, the term sits at the intersection of domestic law and international law. In American legal materials, the status of foreign diplomatic personnel was often addressed through the lens of federal common law and the law of nations as incorporated into early American jurisprudence. Researchers tracing immunity doctrines will need to move between diplomatic correspondence, early federal court decisions, and the law of nations treatises (Vattel, Grotius, Martens) that courts routinely cited.
Third, modern usage has largely replaced this term with specific grades defined under the Vienna Convention on Diplomatic Relations (1961), which establishes a ranked system of diplomatic agents: first secretary, second secretary, third secretary. The older term "secretary of embassy" maps roughly onto this modern hierarchy but does not correspond precisely to any single grade. Researchers crossing between pre- and post-1961 materials should be alert to this shift.
Fourth, in 19th-century American statutes and appropriations legislation, "secretary of legation" and "secretary of embassy" were treated as parallel but distinct offices depending on whether the U.S. maintained an embassy (headed by an ambassador) or a legation (headed by a minister) at a given post. The United States did not routinely exchange ambassadors until the late 19th century; before that, most postings were legations. This means that in earlier American legal and legislative materials, "secretary of legation" is the more commonly encountered term and should be searched alongside "secretary of embassy."
Historical Dictionary Support
Black's defines the term concisely as a diplomatic officer appointed as secretary or assistant to an ambassador or minister plenipotentiary. The entry is brief and functional, adequate for identifying the officer but providing little analytical depth on immunity or rank.
Bouvier's is considerably more instructive. It characterizes the secretary of embassy as "a species of public minister," emphasizing that the officer enjoys immunity in his own right — not merely as a derivative of the ambassador's protection — and that this immunity extends equally whether the secretary is attached to a mission of the first or second rank. The Bouvier's entry also notes that appointment to accompany a minister of inferior rank was possible but uncommon, suggesting that in practice the office was associated with the most senior diplomatic missions.
Both sources agree on the core point: the secretary of embassy is a state-appointed official, not a personal employee, and holds a recognized international legal status. Neither source, however, addresses the internal gradations of secretarial rank that became standard practice in 19th-century diplomacy and were later codified in the Vienna Convention framework. Researchers relying solely on these historical entries will not find guidance on how "secretary of embassy" interacted with emerging treaty-based diplomatic law.
Jurisdictional Note
In U.S. law, the status and immunities of diplomatic personnel including secretaries of embassy are now governed primarily by the Vienna Convention on Diplomatic Relations, to which the United States is a party, and implementing federal legislation. The Diplomatic Relations Act of 1978 (22 U.S.C. § 254a et seq.) is the relevant domestic statutory framework.