In the 'Middle Ages' a squire served as the personal assistant of whom?

The most common definition of squire refers to the Middle Ages. A squire was typically a teenaged boy, training to become a knight. A boy became a squire at the age of 14. Squires were the second step to becoming a knight, after having served as a page. Boys served a knight as an attendant or shield carrier, doing simple but important tasks such as saddling a horse or caring for the knight’s weapons and armour. The squire would sometimes carry the knight’s flag into battle with his master.

A knight typically took his squire into battle and gave him a chance to prove himself. If he proved his loyalty and skill in battle, he would have a “dubbing”, an official ceremony that made him a knight. However, during the Middle Ages, the squire’s rank came to be recognized in its own right; it was no longer assumed that a squire would automatically become a knight. The connection between a squire and any particular knight also ended, as did any shield-carrying duties.