The Royal Society is the learned society founded in London in 1660 and chartered by Charles II in 1662 to study nature through experiment. One of the oldest scientific bodies still in existence, it is best understood as an early working model of organized knowledge: a standing membership that tested claims in public, recorded them, and printed them in a journal so that distant readers could check and extend them. That model of witnessed, published, correctable inquiry became the template for how modern science is done.
The Royal Society chose a motto that still sounds like a dare: take nobody's word for it. No authority, however grand, could settle a question about nature. Only an experiment could, performed in the open and watched by others. Yet the body that made this promise was a club of gentlemen, and in practice a new finding became a fact only once the right men had witnessed it and vouched for what they saw. The institution that told the world to trust no one ran, at bottom, on whose word could be trusted.