Someone else just mentioned the 4 angels in the Euphrates, also. Saturday I sent the letter about the different parts of the Euphrates, the 4 angels bound there, and the possibility of their maybe being the four chief princes of those places. Then, today,  I was  listening to an Endtimes podcast, Deceptive Signs And Wonders, where he briefly speculated on the same thing. That was encouraging that someone else had the same thoughts, or worse, maybe we're both wrong.