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"And ye shall know the truth, and the truth shall make you free." -John 8:32
"TRINITY AND MODALISM EXAMINED..."
Exacting Truth Ministries
The English word Trinity is derived from Latin trīnitās, meaning "the number three, a triad." The corresponding word in Greek is Τριάς, meaning "a set of three" or "the number three." It is the Christian doctrine stating that the one God exists in three persons-the Father, Son, and Holy Spirit.
Tertullian, a Carthage Theologian is credited with first using the words "Trinity", "person" and "substance" to explain that the Father, Son and Holy Spirit are "one in essence-not one in Person". In 325 AD, the First Council of Nicaea established the doctrine of the Trinity and adopted the Nicene Creed, which described Christ as "God of God, Light of Light, very God of very God, begotten, not made, being of one substance (homoousios) with the Father."
Sabellianism, (also known as modalism, modalistic monarchianism, or modal monarchism) is the nontrinitarian belief that the Father, Son and Holy Spirit are different modes or aspects of one God rather than three distinct persons.
Sabellius, a theologian and priest from the third century who defined this viewpoint, is where the term Sabellianism derived from.