Napoleon The Third
Napoleon III
noun
Adding "third generation" to someone's name means that they are the third generation of people with that name. In this case, the person's name is ナポレオン (Napoleon), so this means Napoleon The Third, also written as Napoleon III.
The kanji here are pronounced exactly the same as in the standalone word 三世. That is, it's a jukugo word which uses the on'yomi for both kanji.
ナポレオン三世の本
book on Napoleon The Third
ナポレオン三世のクーデター
Napoleon The Third's coup d’état
ナポレオン三世の弟
Napoleon The Third's younger brother
今日は、ナポレオン三世について学びましょう。
Today, we're going to learn about Napoleon The Third.
ナポレオン三世は1808年に生まれた。
Napoleon III was born in the year 1808.
ナポレオン・ボナパルトはナポレオン三世より有名ですよね。
Napoleon Bonaparte is more famous than Napoleon III, isn't he?