Now I know there is very little fluff about the Adeptus Custodes, and even less about Valdor, but I was wondering if there was any source of fluff that confirmed Constantin Valdor's death.

Basically what I'm thinking is that If he has just been standing around the golden throne there isn't much danger of being killed, and if the custodes were truly created from the emperor ( not sure the exact specifics on their creation however I read that it was a less efficient way than geneseed but they were cloned from the emperor) then Valdor would still be alive in the current 40k timeline.

Just curious because I want to make a hestan/sisters of battle list and would think it would be cool to have Valdor as a counts as Hestan, I know he doens't have to be alive for me to do this but I would like it if he was.