One of many, many variations of the Medieval Knights Code Of Chivalry. No one region, kingdom or country had a unified code, although they did share various aspects between them. The "Rule" of the Knights Templar had 76 parts. Where the one in this image has 17, and I have seen some with as few as seven.
♣ ''A Templar Knight is truly a fearless knight, and secure on every side, for his soul is protected by the armour of faith, just as his body is protected by the armour of steel. He is thus doubly armed, and need fear neither demons nor men." Bernard de Clairvaux, c. 1135, De Laude Novae Militae—In Praise of the New Knighthood. More