His exact date and place of birth are unknown, and little is known of his youth. He became acquainted with the presbyter Dorotheus in Antioch and probably received exegetical instruction from him. In 296 he was in Palestine and saw Constantine who visited the country with Diocletian. He was in Caesarea when Agapius was bishop and became friendly with Pamphilus, with whom he seems to have studied the text of the Bible, with the aid of Origen's Hexapla, and commentaries collected by Pamphilus, in an attempt to prepare a correct version.
In 307 Pamphilus was imprisoned, but Eusebius continued their project. The resulting defence of Origen, in which they had collaborated, was finished by Eusebius after the death of Pamphilus and sent to the martyrs in the mines of Phaeno in Egypt. Eusebius then seems to have gone to Tyre and later to Egypt, where he first suffered persecution. The charge that he obtained his liberty by sacrificing to the gods is unfounded.
Eusebius is next heard of as bishop of Caesarea. He succeeded Agapius, whose time of office is not known, but Eusebius must have become bishop soon after 313. Nothing is known about the early years of his tenure, but with the beginning of the Arian controversies he becomes prominent. Arius appealed to him as his protector, and from a letter of Eusebius to Alexander it is evident that he aided the exiled presbyter. When the Council of Nicaea met in 325, Eusebius was prominent in its transactions. He was not naturally a leader or a deep thinker, but as a very learned man and a famous author who enjoyed the special favour of the emperor, he came to the fore among the 300 members of the council. The confession which he proposed became the basis of the Nicene Creed.
Eusebius was involved in the further development of the Arian controversies. For instance, in the dispute with Eustathius of Antioch, who opposed the growing influence of Origen and his practice of an allegorical exegesis of scripture, seeing in his theology the roots of Arianism, Eusebius, an admirer of Origen, was reproached by Eustathius for deviating from the Nicene faith, and was charged in turn with Sabellianism. Eustathius was accused, condemned and deposed at a synod in Antioch. The people of Antioch rebelled against this action, while the anti-Eustathians proposed Eusebius as the new bishop, but he declined.
After Eustathius had been removed, the Eusebians proceeded against Athanasius of Alexandria, a much more dangerous opponent. In 334 he was summoned before a synod in Caesarea; he did not attend. In the following year he was again summoned before a synod in Tyre at which Eusebius presided. Athanasius, foreseeing the result, went to Constantinople to bring his cause before the emperor. Constantine called the bishops to his court, among them Eusebius. Athanasius was condemned and exiled at the end of 335. At the same synod, another opponent was successfully attacked. Marcellus of Ancyra had long opposed the Eusebians, and had protested against the reinstitution of Arius. He was accused of Sabellianism and deposed in 336. Constantine died the next year and Eusebius did not long survive him. Eusebius died (probably at Caesarea), in 340 at the latest and probably on May 30, 339.
Of the extensive literary activity of Eusebius, a relatively large portion has been preserved. Although posterity suspected him of Arianism, Eusebius had made himself indispensable by his method of authorship; his comprehensive and careful excerpts from original sources saved his successors the painstaking labor of research. Hence much has been preserved which otherwise would have been destroyed.
The literary productions of Eusebius reflect on the whole the course of his life. At first he occupied himself with works on Biblical criticism, under the influence of Pamphilus and probably of Dorotheus of the School of Antioch. Afterward the persecutions under Diocletian and Galerius directed his attention to the martyrs of his own time and the past. And this led him to the history of the whole Church and finally to the history of the world, which to him was only a preparation for ecclesiastical history.
Then followed the time of the Arian controversies, and dogmatic questions came into the foreground. Christianity at last found recognition by the State; and this brought new problems-- apologies of a different sort had to be prepared. Lastly, Eusebius, the court theologian, wrote eulogies in praise of the first Christian emperor. To all this activity must be added numerous writings of a miscellaneous nature, addresses, letters, and the like, and exegetical works which include both commentaries and treatises on Biblical archeology and extend over the whole of his life.
1. Works on Biblical Text Criticism
Pamphilus and Eusebius occupied themselves with the text criticism of the Septuagint text of the Old Testament and especially of the New Testament. An edition of the Septuagint seems to have been already prepared by Origen, which, according to Jerome, was revised and circulated by Eusebius and Pamphilus. For an easier survey of the material of the four Evangelists, Eusebius divided his edition of the New Testament into paragraphs and provided it with a synoptical table so that it might be easier to find the pericopes which belong together.
2. The "Chronicle"
The two greatest historical works of Eusebius are his "Chronicle" and his "Church History." The former (Greek, Pantodape historia, "Universal History") is divided into two parts. The first part (Greek, Chronographia, "Annals") purports to give an epitome of universal history from the sources, arranged according to nations. The second part (Greek, Chronikoi kanones, "Chronological Canons") attempts to furnish a synchronism of the historical material in parallel columns.
The work as a whole has been lost in the original, but it may be reconstructed from later chronographists of the Byzantine school who made excerpts from the work with untiring diligence, especially George Syncellus. The tables of the second part have been completely preserved in a Latin translation by Jerome, and both parts are still extant in an Armenian translation, but these translations do not possess great value on account of numerous interpolations. The "Chronicle" as preserved extends to the year 325. It was written before the "Church History."
3. The "Church History"
In his "Church History" or "Ecclesiastical History" (Historia Ecclesiastica), Eusebius attempted according to his own declaration (I, i. 1) to present the history of the Church from the apostles to his own time, with special regard to the following points:
The authenticity of Eusebius's "Church History" is beyond dispute. Every new discovery shows anew the conscientious, careful and intelligent use of the libraries of Caesarea and Jerusalem.
In one quote from Eusebius, he blames the calamities which befell the Jewish nation on the Jews' role in the death of Jesus. This quote has been used to attack both Jews and Christians. See Christianity and anti-Semitism.
Before he compiled his church history, Eusebius edited a collection of martyrdoms of the earlier period and a biography of Pamphilus. The martyrology has not survived as a whole, but it has been preserved almost completely in parts. It contained:
5. Apologetic and Dogmatic Works
To the class of apologetic and dogmatic works belong:
6. Exegetical and Miscellaneous Works.
Of the exegetical works of Eusebius nothing has been preserved in its original form. The so-called commentaries are based upon late manuscripts copied from fragments of catenae. A more comprehensive work of an exegetical nature, preserved only in fragments, is entitled "On the Differences of the Gospels" and was written for the purpose of harmonizing the contradictions in the reports of the different Evangelists. It was also for exegetical purposes that Eusebius wrote his treatises on Biblical archeology:
From a dogmatic point of view, Eusebius stands entirely upon the shoulders of Origen. Like Origen, he started from the fundamental thought of the absolute sovereignty (monarchia) of God. God is the cause of all beings. But he is not merely a cause; in him everything good is included, from him all life originates, and he is the source of all virtue. He is the highest God to whom Christ is subject as the second God. God sent Christ into the world that it may partake of the blessings included in the essence of God. Christ is the only really good creature, he possesses the image of God and is a ray of the eternal light; but the figure of the ray is so limited by Eusebius that he expressly emphasizes the self-existence of Jesus.
Eusebius was intent upon emphasizing the difference of the persona of the Trinity and maintaining the subordination of Jesus to God (he never calls him theos) because in all contrary attempts he suspected polytheism or Sabellianism. Jesus is a creature of God whose generation, it is true, took place before time. Jesus is in his activity the organ of God, the creator of life, the principle of every revelation of God, who in his absoluteness is enthroned above all the world. This divine Logos assumed a human body without being altered thereby in any way in his being. The relation of the Holy Spirit within the Trinity Eusebius explained similarly to that of the Son to the Father. No point of this doctrine is original with Eusebius, all is traceable to his teacher Origen. The lack of originality in his thinking shows itself in the fact that he never presented his thoughts in a system.
2. His Excellencies and Limitations
The limitations of Eusebius are closely connected with his gifts. His time justly considered him its most learned man. A list of the sources he used for his church history would show what an amount of work had to be done to elaborate and sift the mass of material. But the learning of Eusebius can not be measured with that of Origen. Origen was a productive spirit, Eusebius a compiler. Eusebius, however, distinguished himself by his carefulness. A man like Eusebius was not without weight in the time when barbarian nations began to invade the Church in large masses. In the time which followed nobody excelled him in learning. Church historians were able to copy him, but they could not supply his place.
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Initial text from Schaff-Herzog Encyc of Religion, subjected to edits for style.