During the Ming and Qing Dynasties, Jiande was the capital of Yanzhou Prefecture (fu). On account of this, Jiande was often referred to as Yanzhou Fu (严州府). A transcription commonly seen in both French and English writing of the time was Yen-tcheou-fou, derived from French missionary writing.
^Yen-tcheou-fou was also used to transcribe the name of the city and prefecture in Shandong. (Both places' names are transcribed as "Yanzhou" in pinyin, but are written with different Chinese characters).