I have come across a reference in a German guide book on Iran that suggests the roots of knightly culture in European Middle Ages may be found in the Sassanian Empire (224 to 651 AD; translation courtesy of Google Translate with one correction):
One element of the Sassanian Empire found its way into Europe through Mauritania centuries later: knightly culture. The Sassanids already maintained [courtly love], tournaments and a code of honor - everything that was also part of knighthood according to European understanding.
Assuming that this is an accepted view among historians, how did the transfer occur (in more detail) and which historian (or school of historians) first pointed out this link? Presumably some traces must also exist in Muslim culture for it must have served as "vector" via Mauritania and presumably Spain, so what would such evidence be?