What is a trained soldier or specialist in war during feudal times was called?

A trained soldier or specialist in war during feudal times was commonly referred to as a "knight." Knights were heavily armored cavalrymen who served a lord in exchange for land or other rewards, adhering to a code of chivalry that emphasized bravery, honor, and loyalty. They played a crucial role in the military structure of feudal societies, often participating in battles and tournaments to demonstrate their skills and valor.