Holy Orders is the sacrament received to become a member of the clergy. If this is what you are referring to then the answer is Jesus Christ. It began at the last supper when he instructed the apostles to create a church by doing as he did (turning bread into his body, wine into his blood). However, a more practical initiation of the clergy took place at Pentecost when the Holy Spirit was sent to encourage the apostles to go out and spread the faith.
A bishop is the minister of the sacrament of Holy Orders.
the sacrament of holy orders
Holy Orders- it is the scarament received when being ordained Deacon, Priest, and Bishop
The sacrament of Holy Orders can be administered to a priest by a bishop who has the authority to ordain priests within the Catholic Church.
All catholic deacons, priests, and bishops receive the sacrament of holy orders.
Holy Orders
A person is ordained a priest in the sacrament of Holy Orders. Usually, persons are ordained as Deacons before they are ordained as priests.
The local bishop and anyone higher who has received episcopal consecration ,have the power to administer the Sacrament.
At the Last Supper ( Holy Thursday)
Ordained Ministers in the Catholic Church receive the sacrament of holy orders. This one sacrament has three levels. The first level is the episcopate for the ordination of bishops. The second level is the priesthood for the ordination of priests, and the third level is the diaconate for the ordination of deacons. Resources: The Catechism of the Catholic Church from paragraph 1536 to 1589
The third sacrament of Holy Orders is the Sacrament of the Episcopate, which ordains bishops. Bishops are responsible for the spiritual leadership and governance of a diocese and have the authority to ordain priests and deacons. They are seen as successors to the apostles, entrusted with teaching, sanctifying, and governing the Church.
It is the sacrament in which one becomes a priest.