Translation guide
The English title 'duke' refers to a high-ranking nobleman. In Japanese, the equivalent title is 公爵 (こうしゃく), but its usage differs from English. This guide explains how to refer to dukes in Japanese, including the title itself, forms of address, and related expressions.
Referring to the noble rank of duke in general or as a title.
The standard Japanese word for 'duke'. Used in historical or European contexts. Can be used as a title before a name (e.g., ウェリントン公爵).
He holds the title of duke.
The Duke of Wellington was a famous military man.
A shorter form of 公爵, often used in compound words or formal titles. Can also mean 'prince' in some contexts, so be careful.
公 can also mean 'prince' or 'lord' in other contexts, so context is important.
Prince Philip, Duke of Edinburgh
How to address a duke in conversation or correspondence.
In Japanese, you would typically address a duke as 公爵様 (こうしゃくさま) or 公爵殿下 (こうしゃくでんか). 殿下 is more formal and used for royalty or high nobility.
Your Grace, it is an honor to meet you.
Your Grace, I hope you are well.
閣下 (かっか) is a very formal title equivalent to 'Your Excellency' and can be used for high-ranking nobles including dukes, but it is less specific.
Your Excellency, your orders.
Referring to the territory ruled by a duke.
The standard term for a duchy or dukedom.
The duchy was vast.
Can mean 'duchy' or 'principality'. Often used for sovereign or semi-sovereign states ruled by a duke or prince.
公国 can refer to a principality, not necessarily a duchy. Context determines the exact meaning.
Referring to a duchess.
The standard term for 'duchess', the wife of a duke.
The duchess is known for her charity work.
Referring to a duke-like rank in Japanese history or other cultures.
公爵 is also used for equivalent ranks in non-European contexts, such as Chinese history (e.g., 公).
The Chinese duke was a high rank in the feudal era.
In Japanese history, 公 was used for high-ranking nobles, but the European-style peerage system (公爵 etc.) was adopted in the Meiji era.
The Japanese word 公爵 specifically means 'duke'. Do not use 王子 (おうじ, prince) or 皇太子 (こうたいし, crown prince) for a duke. In some contexts, 公 can mean 'prince', so be careful with that character alone.
When referring to a specific duke, the title usually comes after the name or territorial designation, e.g., ウェリントン公爵 (Duke of Wellington). This is similar to English usage.
The Duke of Edinburgh
Often shortened to 公 in formal titles.
He was made a duke.
the Principality of Monaco
Minamoto no Yoritomo was called 'Lord Minamoto' before becoming shogun.