Identify two established by the Roman Catholic Church.

1. The doctrine of the Trinity: The Roman Catholic Church teaches that God exists as three persons in one essence: the Father, the Son (Jesus Christ), and the Holy Spirit. This doctrine is considered a foundational belief of the Catholic faith.

2. The sacraments: The Roman Catholic Church recognizes seven sacraments as instituted by Christ and essential for the spiritual life of believers. These sacraments include Baptism, Confirmation, Eucharist, Reconciliation, Anointing of the Sick, Holy Orders, and Matrimony. The Church believes that these sacraments are channels of God's grace and are necessary for salvation.

1. Sacraments: The Roman Catholic Church has a system of seven sacraments, which are regarded as essential rites for the spiritual life of believers. These sacraments include baptism, confirmation, Eucharist, penance, anointing of the sick, holy orders, and marriage.
2. Canon Law: Canon law is a body of laws and regulations that govern the Roman Catholic Church. It covers a wide range of topics, including the structure of the Church, the rights and obligations of its members, and the procedures for conducting certain rituals and ceremonies. Canon law is based on biblical teachings, the writings of the Church Fathers, and papal decrees.