Where does “хладнокровие” come from?

хладнокровие (Russian) comes from French sang-froid, from French sang, from Old French sanc, from Vulgar Latin sanguem, from Latin sanguinem, from Latin sanguen, from Latin san-, from Proto-Indo-European h₁sh₂-én- — blood.

хладнокровие (Russian): sang-froid, composure