from where did this term within the inverted comma originate?
From a  print in English in 1794.
Ancien Régime
The term "Ancien Régime" first appeared in print in English in 1794 (two years after the inauguration of the First French Republic), and was originally pejorative in nature;
who was walter de coventre? A 14th-century ecclesiastic. where was he from? It is speculated that he may have been from Abernethy. from where did he complete his education? He did his B.A. from the University of Paris and studied civil law from the University of Orléans. any information regarding his background? According to D.E.R. Watt, Walter might have two brothers- John and William. He might also have been connected to Margaret de Abernethy. who is this this last person? The probable owner of the barony of Inverarity, the church there. where is this mentioned place located? In Angus, Scotland, UK. when was the former university established? In 1150. do you know any of its faculty members? UNANSWERABLE is it still there or closed? It was shut down. when? In 1970. why? UNANSWERABLE before getting completely closed, was it abolished anytime? Yes, in 1793 during the French Revolution. can you mention one cause behind this revolution? It was caused by the  inability of the "Ancien Régime" to manage increasing social and economic inequality.
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Ancien Régime [SEP] Origin of the term
The term "Ancien Régime" first appeared in print in English in 1794 (two years after the inauguration of the First French Republic), and was originally pejorative in nature; Simon Schama has observed: "virtually as soon as the term was coined, 'old regime' was automatically freighted with associations of both traditionalism and senescence. It conjured up a society so encrusted with anachronisms that only a shock of great violence could free the living organism within. Institutionally torpid, economically immobile, culturally atrophied and socially stratified, this 'old regime' was incapable of self-modernization."