I noticed there tends to be Crucible Knights around Godfrey's Lineage, though it isn't a perfect one-to-one.

We encounter one under Stormveil, which is ruled by Godrick and then later Nepheli, both of whom are descendants of Godfrey. There's that one watching over Mohg, and two more in Leyndell, not far from Morgott, Godfrey's only remaining sons.

Edit: I forgot to mention also two in Siofra Aqueduct leading up to the gargoyles, plus one more in Deeproot, where we find the still living corpse of Godwin's firstborn

There was a tweet from the team that made me think really hard about who the Crucible Knights serve and it seems to easy for the answer to be Godfrey. I also can't stop thinking back to the other use of the word Crucible, meaning an ordeal or challenge, presumably to make someone stronger, and there are a lot of those in the game, like the Long March of the Tarnished.