The Jay Graber Mundus Sine Caesaribus Shirt made waves at SXSW 2025, worn by Bluesky CEO Jay Graber to troll Meta’s Mark Zuckerberg. Featuring the Latin phrase “Mundus sine caesaribus” (“a world without Caesars”), this black tee became an instant hit after Graber’s keynote, capturing the internet’s attention as a symbol of tech rebellion.
Jay Graber Rocks the Mundus Sine Caesaribus Shirt – A Bold Design with Classical Flair
This Jay Graber Mundus Sine Caesaribus Shirt showcases “Mundus sine caesaribus” in subtle gray font, curving around the chest for a striking effect. Spotted on Graber during her SXSW speech, the minimalist design makes it perfect for tech events or casual wear, blending modern style with a nod to ancient Rome.

The phrase “Mundus sine caesaribus” rejects centralized power, countering Zuckerberg’s “Aut Zuck aut nihil” shirt. It reflects Bluesky’s vision of a decentralized social media world where users, not tech “Caesars,” hold control—a powerful message wrapped in Latin elegance.
Own this shirt and support decentralization! With Bluesky’s 25.9 million users behind it, this tee is a statement. Grab yours at Eletees—stock is limited, so act fast!