In the 19th and early 20th centuries, some writers emulated the classical list by creating their own lists with names such as "Wonders of the Middle Ages", "Seven Wonders of the Middle Ages", "Seven Wonders of the Medieval Mind", and "Architectural Wonders of the Middle Ages".[2] It is unlikely that any of these lists actually originated in the Middle Ages since the concept of a "Middle Age" did not become popular until at least the 16th century and the word "medieval" was not invented until the Enlightenment era. Brewer's Dictionary of Phrase and Fable refers to them as "later list[s]",[3] suggesting the lists were created after the Middle Ages.