How to Communicate at a Fast Speed?

The idea is being able to communicate at i speed. And there is an interesting scenario where that got out of hand. It might be legendary cause it's so old. The last guy who was king of the hyper ancient chinese jo dynasty was a guy named you or yo, i don't know. He had a concubine who really hit it off withand he gradually started to displace some other kingdom's daughter and her kid. So this was causing some political problems. But they had a beacon system to rally all the local nobles if they were under attack,. by the raiders that gave them problems at that.