Basil of Caesarea, also called Saint Basil the Great, (329 or 330 – January 1, 379) (Greek: Ἅγιος Βασίλειος ὁ Μέγας) was the Greek bishop of Caesarea Mazaca in Cappadocia, Asia Minor (modern-day Turkey). He was an influential theologian, who supported the Nicene Creed and opposed the heresies of the early Christian Church, fighting against both Arianism and the followers of Apollinaris of Laodicea. His ability to balance his theological convictions with his political connections made Basil a powerful advocate for the Nicene position.

In addition to his work as a theologian, Basil was known for his care of the poor and underprivileged. Basil established guidelines for monastic life which focus on community life, liturgical prayer, and manual labour. Together with Pachomius he is remembered as a father of communal monasticism in Eastern Christianity. He is considered a saint by the traditions of both Eastern and Western Christianity.

Basil, Gregory of Nazianzus, and Gregory of Nyssa are collectively referred to as the Cappadocian Fathers. The Eastern Orthodox Church and Eastern Catholic Churches have given him, together with Gregory of Nazianzus and John Chrysostom, the title of Great Hierarch. His is recognised as a Doctor of the Church in both Eastern Orthodoxy and Roman Catholicism. He is sometimes referred to by the epithet "Ουρανοφαντωρ", translatable as "revealer of heavenly mysteries".

Caesarea (Hebrew: קֵיסָרְיָה‎‎; Arabic: قيسارية‎, Kaysaria; Greek: Καισάρεια) is a town in Israel located mid-way between Tel Aviv and Haifa (45 km), on the Israeli coastal plain near the city of Hadera. Modern Caesarea as of December 2007 has a population of 4,500 people. It is the only Israeli locality managed by a private organization, the Caesarea Development Corporation, and also one of the most populous localities not recognized as a local council. It lies under the jurisdiction of the Hof HaCarmel Regional Council.

The town was built by Herod the Great about 25-13 BCE as the port city Caesarea Maritima. It served as an administrative center of Judaea Province of the Roman Empire, and later the capital of the Byzantine Palaestina Prima province during the classic period. Following the Arab conquest in the 7th century, the city fell into obscurity until Crusader renovation, but was again abandoned after the Mamluk conquest. It was populated in 1884 by Muslim Bosnyak immigrants, making it a small fishing village. In 1940, kibbutz Sdot Yam was established on Jewish lands next to the Bosnyak village. During the Civil War in Mandatory Palestine, the town was abandoned by the Bosnyak residents, and in 1952 a Jewish town of Caesarea established near the ruins of the old city, which were made into the national park of Caesarea Maritima.

Gregory of Nyssa (c. 335 – c. 395) (also known as Gregory Nyssen) was bishop of Nyssa from 372 to 376, and from 378 until his death. He is venerated as a saint in Roman Catholicism, Eastern Orthodoxy, Oriental Orthodoxy, Lutheranism and Anglicanism. Gregory, his brother Basil of Caesarea and Gregory of Nazianzus are collectively known as the Cappadocian Fathers

Gregory lacked the administrative ability of his brother Basil, or the contemporary influence of Gregory of Nazianzus, but was an erudite theologian who made significant contributions to the doctrine of the Trinity and the Nicene creed. Gregory's philosophical writings were influenced by Origen, and he is generally considered to have believed in universal salvation. Since the mid-twentieth century, there has been a significant increase in interest in Gregory's works from the academic community, which has resulted in challenges to many traditional interpretations of his theology.