The God-Bringers! These are famous knight-like characters of legend. Their number includes ILYA-MUROMETS and MIKULA. Although mortal, they had various special powers such as super-strength, swiftness of foot, and bucketfuls of heroic pluck. Possibly also X-ray vision.
Like a somewhat down-to-earth version of the Knights of the Round Table, they were a motley collection of farmers who were elevated to hero rank and starred in many celebrated dragon-busting tales.
They were squeezed out by the Christians and now only the legends remain. You can read all about it in ’Why There Are No More Bogatyri In Holy Russia’ — if you are into ancient Russian poetry and can find a copy.