Impropriation, a term from English ecclesiastical law, was the destination of the income from tithes of an ecclesiastical benefice to a layman. With the establishment of the parish system in England, it was necessary for the properties to have an owner. This was the parochianus or parson/rector who was sustained by the benefice income while providing personally for the cure-of-souls. The parson was technically a corporation sole. With the passage of time, the benefice came to be considered a piece of property whose holder could discharge the spiritual responsibilities by a deputy and many were appropriated by monasteries or other spiritual corporations. These were bound to provide for a cleric for the cure of souls in the parish but could use any excess income as they pleased. The deputy was often known as the 'vicar'.