Ballet Folklorico de Mexico was created in 1952.
Scènes de ballet - Taras - was created in 1972.
Ballet Comique de la Reine was created in 1581.
It was premiered at the Théâtre de l'Académie Royale de Musique in Paris and as Paris and France were (and still are) great centres of ballet I assume that Coppelia was created there.
Agnes De Mille
Robert de Ashton died in 1385.
The person who created the ballet flat in dance was Marie Anne de Cupis de Camargo. She decided that women needed to stop dancing in their heels so she created the traditional ballet slipper. If you are talking about ballets flats as in regular shoes i have no clue. Sorry if this does not answer your question.
Sir John de Ashton II died in 1428.
"un grand connaisseur de ballet" or "un grand amateur de ballet"
Corps de Ballet
Zapatos de ballet is the Spanish term for ballet shoes.
The most famous ballet company in Paris is the Paris Opera Ballet. In French, the name is "Ballet de l'Opera national de Paris".