Who could be a knight?

Theoretically, anyone could become a knight. However, being a knight was quite expensive. Knights were required to purchase heavy armor to help their survival rate, good weapons, and at least two horses—one to ride and one to carry their equipment. If captured, be it in battle or in tournament, a knight had to pay a hefty ransom. He also lost his horse and armor to his victorious captor. If the knight became successful, he had to maintain his position lavishly. This included supporting...