Who invented Satoshi core?

Could you please enlighten me on a matter of some curiosity? I've been hearing quite a buzz about the Satoshi core, but I'm not entirely clear on its origins. Could you tell me, who invented the Satoshi core? I've read conflicting reports, some pointing to a group of developers and others claiming it was the brainchild of a single individual. I'm rather perplexed and would greatly appreciate some clarification on this matter. Thank you for your time and assistance in this matter.