This is a nice dicusion, but I have two points of order.
1. Stirrups are far less important than the saddle, the former stabalises the rider, the latter helps distribute the impact of the cahrge.
2. Northumbrian horsemen of the 8th Century are depicted using what is arguably the "couched" posture when fighting Picts, similarly there are instances of couched or semi-couched poses in antiquity, though they are rare. This implies the technique was nown before the 10th Century.
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