where does the term pardon my french come from
Pardon my French At least one source[3] suggests that the phrase "derives from a literal usage of the exclamation. In the 19th century, when English people used French expressions in conversation they often apologized for it - presumably because many of their listeners (then as now) wouldn't be familiar with the language". The definition cites an example from The Lady's Magazine, 1830:[4]
Anglo-Norman language French was the mother tongue of every English king from William the Conqueror (1066-1087) until Henry IV (1399–1413). Henry IV was the first to take the oath in English, and his son, Henry V (1413–1422), was the first to write in English. By the end of the 15th century, French became the second language of a cultivated elite.[8]