So, I was flipping through some stuff, on Lexicanum, and they mentioned the Conquest, from Battlefleet Koronus. I was reminded one of the reasons I've always liked the ship is the "ships of the first Rogue Traders" bit, to paraphrase. This got me thinking, though, when actually did Rogue Traders start doing their thing? There are mentions, in some of the fluff, that the first Warrants of Trade were penned by the Emperor, Himself, and that a degree of their freedom was on account of Him being their author, while today, newer Warrants might be riddled with catches, loopholes, and other such crap. Thing is, some of these "allowances" don't seem likely by the Emperor, a being known for His inflexibility, at times. There were certain allowances He wouldn't even make for His Primarch sons, or the Astartes Legions. Also, much of the end of His time as Emperor was during the Great Crusade, and the following Horus Heresy, where He would've needed to be able to monitor the loyalty of everyone, as half His most trusted, and half of many organizations, sided with the Archtraitor. During such times of conflict, it seems unlikely that the Emperor would be dispatching explorers out to the edges of His space, when such resources would prove more necessary MUCH closer to home. That the Conquest, potentially the first RT vessels, were cruiser class, so real warships, seems even more unlikely.
That none of the Warrants seems to conflict with the religion that sprang up, later, or mention the secular nature of the Imperial Truth, which would've been the case, had the Emperor penned them, it just seems unlikely that the Emperor, Himself, set the Rogue Traders into motion, and while I'd then blame Malcador the Sigilite, who could act in the Emperor's name, and did set several of the Imperium's greatest organizations into motion, I'd think the war would've kept him too busy, too, not even including the need to master the Astronomicon, which then killed him, as the Emperor died, as well (well, what, for the Emperor, passes for "dying", anyway).
So, how did the Rogue Traders, with all their ridiculous authority, come into being? The fluff I've mentioned might very well be correct, and I'm just misinterpreting it, but this could be a fun, little topic to discuss. Thanks much!