In the Middle Ages, a squire was the shield- or armour-bearer of a knight.
A knight and his squire
Wolfram von Eschenbach and his squire (Codex Manesse, 14th century)
A squire cleaning armour
A squire helping his knight, in a historical reenactment in 2009
A knight is a person granted an honorary title of knighthood by a head of state or representative for service to the monarch, the church or the country, especially in a military capacity.
A 14th-century depiction of the 13th-century German knight Hartmann von Aue, from the Codex Manesse
A Norman knight slaying Harold Godwinson (Bayeux tapestry, c. 1070). The rank of knight developed in the 12th century from the mounted warriors of the 10th and 11th centuries.
Hungarian knights routing Ottoman spahi cavalry during the Battle of Mohács in 1526
David I of Scotland knighting a squire