> Peter Alfonsi, in his work Disciplina Clericalis, listed chess among the seven skills that a good knight must acquire.

https://en.wikipedia.org/wiki/Disciplina_clericalis

> Disciplina clericalis is a book by Petrus Alphonsi. Written in Latin at the beginning of the 12th century, it is a collection of 33 fables and tales and is the oldest European book of its kind.

The English translation - https://en.wikisource.org/wiki/Disciplina_Clericalis

https://en.wikisource.org/wiki/Disciplina_Clericalis/Tale_4

> Then, the accomplishments are: Riding, swimming, archery, boxing, the chase, chess, writing verse. The virtues (industriae) are: not to be a glutton, a drunkard, a sybarite, not to be given to violence, to lying, covetous, and of evil life." The disciple: "At the present time I do not believe there is any man of this kind."

The latin passage (from https://la.wikisource.org/wiki/Disciplina_clericalis ):

> Probitates vero hae sunt: Equitare, natare, sagittare, cestibus certare, aucupare, scaccis ludere, versificari.