there is an honour given to guardsmen, indeed based off olanious the pious, who in the original story stepped in and sheilded the emperor, or distracted horus long enough for the emperor to strike back.
he was written brilliantly i must admit, so much of the old fluff covered yet still relevant in the current post retcon stories. i love how a few of the books have mention of him too, maybe he will get a book of his own??
[URL="http://wh40k.lexicanum.com/wiki/Ollanius_Pius#.UL0-iIa0OME"]here [/URL]has most of the info.
although Ol is said to have died, i think however he may indeed live on after the end of the heresy, just as a shodow figure. then again he may well be the 'immortal' on the golden throne.... you know since the emperor died and all that