Damn these guys knew high level BJJ..
Accordingly the antagonist of Arrichion, having already clinched him around the middle, thought to kill him; already he had wound his forearm about the other’s throat to shut off the breathing, while, pressing his legs on the groins and winding his feet one inside each knee of his adversary, he forestalled Arrichion’s resistance by choking him till the sleep of death thus induced began to creep over his senses. But in relaxing the tension of his legs he failed to forestall the scheme of Arrichion; for the latter kicked back with the sole of his right foot (as the result of which his right side was imperiled since now his knee was hanging unsupported), then with his groin he holds his adversary tight till he can no longer resist, and, throwing his weight down toward the left while he locks the latter’s foot tightly inside his own knee, by this violent outward thrust he wrenches the ankle from its socket
https://en.wikipedia.org/wiki/Arrhichion
The other guy took the back, got hooks with his legs, and had a RNC in, but the other guy kicked one of the hooks out and then got a reverse figure 4 ankle lock, and Palharesed him. I'm also surprised that the historian could write it that kind of technical detail.. it means the audience was familiar and actually educated in the small details of grappling. That means it must have been much more developed skill-wise than most of us think..