Physical ability for knightly sports including strength, speed, dexterity, training, tactical ability, cunning. In short, martial excellence. Prowess is the basic virtue shared by all martial societies, whether it be excellence in swordsmanship, horsemanship, or in the modern day, movement and marksmanship. Early on these warrior virtues were augmented by additional virtues suggested by the romances and the church, yielding a more rounded gentleman. As late as the Renaissance, Christine de Pisan and Baldassare Castiglione still counted Prowess as an important quality for the courtier.

Distinguished bravery; valor; especially, military bravery and skill; gallantry; intrepidity; fearlessness.

a superior skill that you can learn by study and practice and observation; "the art of conversation"; "it's quite an art"