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What is the Grey Knights' history with the Dark Angels and where can it be read?
Stern of the Grey Knights and Ragnar of the Wolves wound up on the 'Rock' - Ragnar gets filthy looks for being a Space Wolf but Stern gets nothing of the sort for being a stranger on the ultra paranoid Dark Angels' home turf, as far as I'm aware the Wolves are the only non-inquisition astartes chapter that knows of the Grey Knighs and doesn't get mind wiped for it so - What is the history with the Angels and Knights?

I don't know of any noteworthy history between the two chapters, but I would note that GW is wildly inconsistent about the secrecy of the Grey Knights. Especially in BL novels, it is not uncommon for everyone to know exactly who the Grey Knights are as soon as they arrive.

They had recently fought together during the Pandorax campaign.

Yeah pandorax is well worth a read. There is a fair bit of tension between them by the end, which isn't helped by Draigo sucker punching Azreal...

Yeah Pandorax is a good read for this. Not to give away anything but its pretty obvious they have dealt with each other a lot. Enough that Draigo and Azreal realllllyyyy don't like each other.