Red Ads commonly set up territories in iris territories, though well below Emperor level. Indeed, one way of finding new Emperor territories is to look for Red Ad territories, and then look upwards.
Battling territorial Red Ads also chase each other about at speed, though usually not at irisian level - but we can at a distance mistake atalanta for iris because of this behaviour. Atalanta doesn't, however, engage in the classic circling squabble of iris males. Brothers c-album and cardui also chase each other about, sometimes high up - out of sight & out of mind, like iris. So we can confuse these lesser mortals for the Monarch of all the Butterflies at a distance. Beware of false prophets, for many will come in His name... A male Emperor will, of course, see off any of this riff-raff.
Here is a couple of pix of a male Red Ad that adopted Brother Neil as a perching point below the Marlpost Wood North Gate iris territory this season. Red Ad males are almost ubiquitous here during the Purple season -
Note the use of Grecian 2011 in the above pic... It proved, though, useless as a bait for iris.