Lacoste helped craft the worlds of some of the most popular games in the franchise, including Black Flag and Origins.
Sharing the news on Twitter, Lacoste said:
It is not without emotions I have to tell you that after 8 assassins, 16 years at Ubisoft I have decided to set sails on new adventures and challenges.
I would like to thank from the bottom of my heart our wonderful community and the incredible talents I’ve had the chance to collaborate with, over these amazing years.
Thank you too, Ubisoft, for your trust and the fantastic projects we brought to life together! Bye for now, these years will remain unforgettable
Lacoste's departure comes as the franchise is set to shift and embrace the online, living game, live-service model with Assassin's Creed Infinity - a new platform that will house future adventures and experiences.
We discussed whether or not we need Assassin's Creed Infinity and the experience it is promising. But, while we wait for that game to arrive, Assassin's Creed Valhalla will get a new stream of expansions this year and next with Siege of Paris set to arrive this Summer.
You can keep up to date with everything we know about this new DLC, including recent leaks, here.