From Poster House NYC website:

Alphonse Mucha, born in Bohemia, came to Paris in 1887. Over the next 8 years, he emerged from obscurity to become the most celebrated graphic designer of the Art Nouveau movement. His intricate designs and gorgeous subjects were so popular that he produced pattern books for fellow designers and students, and his publishers repurposed his advertisements for hundreds of other products.

But his style and status all started when he met the legendary Sarah Bernhardt, the most famous actress of her day. Mucha’s first poster for her not only launched his graphic design career, but elevated her fame, as the public buzz for the image was completely unprecedented.

To read more:

https://posterhouse.org/exhibitions/mucha