Commendation

A commendation ceremony (commendatio) is a formal ceremony that evolved during the Early Medieval period to create a bond between a lord and his fighting man, called his vassal (Latin vassus). The first recorded ceremony of commendatio was in 7th century France, but the relationship of vassalage was older, and predated even the medieval formulations of a noble class. The lord's "man" ("vassal" comes from a Celtic word for "boy") might be born unfree, but the commendatio freed him. (See Vassal).

When two men entered into a feudal relationship, they underwent a ceremony known as commendation ceremony. The purpose of the commendation was to make a chosen person a vassal of a lord. The commendation ceremony is composed of two elements, one to perform the act of homage and the other an oath of fealty. In some countries, such as the Kingdom of Sicily, the commendation ceremony came to be referred to as investiture.

The would-be vassal appeared bareheaded and weaponless as a sign of his submission to the will of the lord and knelt before him. The vassal would clasp his hands before him in the ultimate sign of submission, the typical Christian prayer pose, and would stretch his clasped hands outward to his lord.

The lord in turn grasped the vassal's hands between his own, showing he was the superior in the relationship, a symbolic act known variously as the immixtio manuum (Latin), Handgang (German), or håndgang (Norwegian). The vassal would announce he wished to become "the man", and the lord would announce his acceptance. The act of homage was complete.

The vassus thus entered into a new realm of protection and mutual services. Through the touching of hands the warrior chief caused to pass from this own body into the body of the vassal something like a sacred fluid, the hail. Made taboo, as it were, the vassal thereupon fell under the charismatic power, pagan in origin, of the lord: his mundeburdium, or mainbour, true power, at once possessive and protective.

The physical position for Western Christian prayer that is thought of as typical today—kneeling, with hands clasped—originates from the commendation ceremony. Before this time, European Christians prayed in the orans, which is the Latin, or "praying" position that people had used in antiquity: standing, with hands outstretched, a gesture still used today in many Christian rituals.

...
Wikipedia