It seems to be the season for Kenneth MacMillan’s Mayerling, created for the Royal Ballet in 1978. This three-act study of royal privilege and pathology, with not two or three pas de deux but seven (!), tells the story of Crown Prince Rudolf of Austria-Hungary, who ended it all in a hunting lodge, in a suicide pact with his mistress, Mary Vetsera. The Royal Ballet is performing the work through November 30; the Paris Opera through November 12. The productions are the same, both using designs by MacMillan’s frequent collaborator Nicholas Georgiadis. Paris Opera danseurs in the lead role of Rudolf, who is hardly ever offstage, include François Alu, Stéphane Bullion, Mathieu Ganio, Hugo Marchand, and Paul Marque. —Laura Jacobs