http://en.wikipedia.org/wiki/Augustine_of_hippo
Augustine of Hippo (Latin: Aurelius Augustinus Hipponensis)
(November 13, 354 - August 28, 430), also known as
Augustine, St. Augustine, St. Austin, St. Augoustinos,
Blessed Augustine, or St. Augustine the Blessed, was
Bishop of Hippo Regius (present-day Annaba, Algeria). He was
a Latin-speaking philosopher and theologian who lived in the
Roman Africa Province. His writings were very influential in
the development of Western Christianity.
According to his contemporary, Jerome, Augustine
"established anew the ancient Faith". In his early years
he was heavily influenced by Manichaeism and afterward by
the Neo-Platonism of Plotinus. After his conversion to
Christianity and baptism (AD 387), Augustine developed his
own approach to philosophy and theology, accommodating a
variety of methods and different perspectives. He
believed that the grace of Christ was indispensable to human
freedom, and he framed the concepts of original sin and just
war.
When the Western Roman Empire was starting to disintegrate,
Augustine developed the concept of the Church as a spiritual
City of God (in a book of the same name), distinct from the
material Earthly City.[9] His thought profoundly influenced
the medieval worldview. Augustine's City of God was closely
identified with the church, the community that worshipped
God.
In the Catholic Church and the Anglican Communion, he is a
saint and pre-eminent Doctor of the Church, and the patron
of the Augustinian religious order; his memorial is
celebrated 28 August, the day of his death. He is the patron
saint of brewers, printers, theologians, the alleviation of
sore eyes, and a number of cities and dioceses. Many
Protestants, especially Calvinists, consider him to be one
of the theological fathers of Reformation due to his
teaching on salvation and divine grace. In the Eastern
Orthodox Church he is blessed, and his feast day is
celebrated on 15 June. Among the Orthodox, he is called
"St. Augustine", or "St. Augustine the Blessed".