Wikipedia page about this book: https://fr.wikipedia.org/wiki/Monsieur_de_Phocas

Release date is 2012-11-20

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"Monsieur de Phocas, Astarté: Roman" by Jean Lorrain is a novel published in 1901. The Duke de Fréneuse, a jaded aristocrat and ether addict, confides his intimate journal to a narrator. Within these pages, he reveals his obsessive quest for a mysterious "glaucous transparency"—a green light first glimpsed in ancient eyes. This pursuit leads him through precious gems, portraits, and masks, into encounters with the malevolent Claudius Ethal. A cornerstone of Decadent literature, the novel explores decay, perversion, and phantasmagoric visions in fin-de-siècle society. (This is an automatically generated summary.)

Original publication data not identified