Who is the founder of jitō?

Could you please enlighten me about the founder of jitō? I've been hearing quite a lot about this remarkable concept recently and am quite fascinated by its origins. Could you provide me with some insight into the individual or group who initiated this movement? It would be great if you could also share any noteworthy achievements or contributions made by the founder that have significantly influenced the jitō philosophy or practice. I'm keen to understand more about the history and background of this intriguing idea.