The Indo European Word, Rach, Is the Root of Regulate and Regulate

In the words of the original indo europeans, we find a word which has been reconstructed as rech. This word also apparently referred to another kind of powerful leader - an officer other than a tribal chief. The same root can be found in lots of words in modern english and other Indo-European languages. So for example, in latin we have the word rex, which meant king in and we see that word occasionally in english. We even see it in the word terex for a dinosaur, meaning literally, king of the dinosaurs.