Defense of Origen ('Apologia uper Wrisenouß). This was the joint work of Eusebius and Pamphilus, as is distinctly stated by Eusebius himself in his H. E. VI. 33, by Socrates, H. E. III. 7, by the anonymous collector of the Synodical Epistles (Ep. 198), and by Photius, Bibl. 118. The last writer informs us that the work consisted of six books, the first five of which were written by Eusebins and Pamphilus while the latter was in prison, the last book being added by the former after Pamphilus' death (see above, p. 9). There is no reason to doubt the statement of Photius, and we may therefore assign the first five books to the years 307-309, and assume that the sixth was written soon afterward. The Defense has perished, with the exception of the first book, which was translated by Rufinus (Rufin. ad Hieron. I. 582 ), and is still extant in his Latin version. Rufinus ascribed this book expressly to Pamphilus, and Pamphilus' name alone appears in the translation. Jerome (Contra Ruf. I. 8; II. 15, 23; III. 12) maintains that the whole work was written by Eusebius, not by Pamphilus, and accuses Rufinus of having deliberately substituted the name of the martyr Pamphilus for that of the Arianizing Eusebius in his translation of the work, in order to secure more favorable acceptance for the teachings of Origen. Jerome's unfairness and dishonesty in this matter have been pointed out by Lightfoot (p. 340). In spite of his endeavor to saddle the whole work upon Eusebius, it is certain that Pamphilus was a joint author of it, and it is quite probable that Rufinus was true to his original in ascribing to Pamphilus all the explanations which introduce and connect the extracts from Origen, which latter constitute the greater part of the book. Eusebius may have done most of his work in connection with the later books.

The work was intended as a defense of Origen against the attacks of his opponents (see Eusebius' H. E. VI 33, and the Preface to the Defense itself). According to Socrates (H. E. VI. 13), Methodius, Eustathius, Apollinaris, and Theophilus all wrote against Origen. Of these only Methodius had written before the composition of the Defense, and he was expressly attacked in the sixth book of that work, according to Jerome (Contra Ruf. I. 11). The wide opposition aroused against Origen was chiefly in consequence not of his personal character, but of his theological views. The Apology, therefore, seems to have been devoted in the main to a defense of those views over against the attacks of the men that held and taught opposite opinions, and may thus be regarded as in some sense a regular polemic. The extant book is devoted principally to a discussion of Origen's views on the Trinity and the Incarnation. It is not printed in Migne's edition of Eusebius' Opera, but is published in the various editions of Origen's works (in Lommatzsch's edition, XXIV. 289-412). For further particulars in regard to the work, see Delarue's introduction to it (Lommatzsch, XXIV. 263 sq.), and Lightfoot's article on Eusebius, pp. 340 and 341.

Against Marcellus, Bishop of Ancyra (kata Markellou tou 'Agkuraß episkopou). The occasion of this work has been already described (see p. 25), and is explained by Eusebius himself in Book II. chap, 4. The work must have been written soon after the Council at which Marcellus was condemned. It aims simply to expose his errors, exegetical as well as theological. The work consists of two books, and is still extant (Opera, VI. 707-824).

On the Theology of the Church, a Refutation of Marcellus (oi pros Markellon elegkoi peri thß ekklhsiastikhß Qeologiaß). The occasion of this work is stated in the first chapter. In the previous work Eusebius had aimed merely to expose the opinions of Marcellus, but in this he devotes himself to their refutation, fearing that some might be led astray by their length and plausibility. The work, which consists of three books, is still extant, and is given by Migne in the Opera, VI. 825-1046. Both it and the preceding are published with the Contra Hieroclem in Gaisford's Euseb. Pamph. contra Hieroclem et Marcellum, Oxon. 1852. Zahn has written a valuable monograph entitled Marcellus von Ancyra (Gotha, 1867).

Against the Manicheans. Epiphanius (Hær. LXVI. 21) mentions, among other refutations of the Manicheans, one by our Eusebius. The work is referred to nowhere else, and it is possible that Epiphanius was mistaken in his reference, or that the refutation he has in mind formed only a part of some other work, but we are hardly justified in asserting, as Lightfoot does, that the work cannot have existed.

PART 4. IV. Dogmatic Works.

General Elementary Introduction ( 'H kaqolou stoikeiwdhß eisagwgh). This work consisted of ten books, as we learn from a reference to it in the Eclogæ Propheticæ, as we learn from a reference to it in the Eclogæ, IV. 35. It was apparently a general introduction to the study of theology, and covered a great variety of subjects. Five brief fragments have been preserved, all of them apparently from the first book, which must have dealt largely with general principles of ethics. The fragments were published by Mai (Bibl. Nova Patrum, IV. 316), and are reprinted by Migne (Opera, IV. 1271 sq.). In addition to these fragments, the sixth, seventh, eighth, and ninth books of the work are extant under the title:

Prophetical Extracts (ProFhtikai 'Eklogai). Although this formed a part of the larger work, it is complete in itself, and circulated independently of the rest of the Introduction. It contains extracts of prophetical passages from the Old Testament relating to the person and work of Christ, accompanied by explanatory notes. It is divided into four books, the first containing extracts from the historical Scriptures, the second from the Psalms, the third from the other poetical books and from the prophets, the fourth from Isaiah alone. The personality of the Logos is the main topic of the work, which is thus essentially dogmatic, rather than apologetic, as it might at first glance seem to be. It was composed during the persecution, which is clearly referred to in Book I. chap. 8 as still raging; it must have been written therefore between 303 and 313. The date of these books, of course, fixes the date of the General Introduction, of which they formed a part. The Eclogæ are referred to in the History, I. 2. On the other hand, they mention the Chronicle as a work already written (I. I: Opera, p. 1023); a reference which goes to prove that there were two editions of the Chronicle (see above, p. 31). The four books of the Prophetical Extracts were first published by Gaisford in 1842 (Oxford) from a Vienna MS. The MS. is mutilated in many places, and the beginning, including the title of the work, is wanting. Migne has reprinted Gaisford's edition in the Opera, IV. 1017 sq.

On the Paschal Festival (peri thß tou paska eorthß). This work, as Eusebius informs us in his Vita Const. IV. 34, was addressed to the Emperor Constantine, who commends it very highly in an epistle to Eusebius preserved in the Vita Const. IV. 35. From this epistle we learn, moreover, that the work had been translated into Latin. It is no longer extant in its entirety, but a considerable fragment of it was discovered by Mai in Nicetasæ Catena on Luke, and published by him in his Bibl. Nova Patrum, IV. p. 208 sq. The extant portion of it contains twelve chapters, devoted partly to a discussion of the nature of the Passover and its typical significance, partly to an account of the settlement of the paschal question at the Council of Nicæa, and partly to an argument against the necessity of celebrating the paschal feast at the time of the Jewish Passover, based on the ground that Christ himself did not keep the Passover on the same day as the Jews.

Jerome, although he does not mention this work in his catalogue of Eusebius' writings (de vir. ill. 81), elsewhere (ib. 61) states that Eusebius composed a paschal canon with a cycle of nineteen years. This cycle may have been published (as Lightfoot remarks) as a part of the writing under discussion. The date of the work cannot be determined with exactness. It was written after the Council of Nicæa, and, as would seem from the connection in which it is mentioned in the Vita Canstantini, before the Emperor's tricennalia (335 A.D.), but not very long before. The extant fragment, as published by Mai, is reprinted by Migne in the Opera, VI. 693-706.

PART 5. V. Critical and Exegetical Works.

Biblical Texts. We learn from Jerome (Præf. in librum Paralip.) that Eusebius and Pamphilus published a number of copies of Origen's edition of the LXX., that is, of the fifth column of the Hexapla. A colophon found in a Vatican MS., and given in fac-simile in Migne's Opera, IV. 875, contains the following account of their labors (the translation is Lightfoot's): "It was transcribed from the editions of the Hexapla, and was corrected from the Tetrapla of Origen himself, which also had been corrected and furnished with scholia in his own handwriting; whence I, Eusebius, added the scholia, Pamphilus and Eusebius corrected [this copy]." Compare also Field's Hexapla, I. p. xcix.

Taylor, in the Dictionary of Christian Biography, III. p. 21, says: "The whole work [i.e. the Hexapla] was too massive for multiplication; but many copies of its fifth column alone were issued from Cæsarea under the direction of Pamphilus the martyr and Eusebius, and this recension of the LXX. came into common use. Some of the copies issued contained also marginal scholia, which gave inter alia a selection of readings from the remaining versions in the Hexapla. The oldest extant MS. of this recension is the Leiden Codex Sarravianus of the fourth or fifth century." These editions of the LXX. must have been issued before the year 309, when Pamphilus suffered martyrdom, and in all probability before 307, when he was imprisoned (see Lardner's Credibility, Part II. chap. 72.

In later years we find Eusebius again engaged in the publication of copies of the Scriptures. According to the Vita Const. IV. 36, 37, the Emperor wrote to Eusebius, asking him to prepare fifty sumptuous copies of the Scriptures for use in his new Constantinopolitan churches. The commission was carefully executed, and the MSS. prepared at great cost. It has been thought that among our extant MSS. may be some of these copies which were produced under Eusebius' supervision, but this is extremely improbable (see Lightfoot, p. 334).

Ten Evangelical Canons, with the Letter to Carpianus prefixed (kanoneß deka; Canones decem harmoniae evangeliorum præmissa ad Carpianum epistola). Ammonius of Alexandria early in the third century had constructed a harmony of the Gospels, in which, taking Matthew as the standard, he placed alongside of that Gospel the parallel passages from the three others. Eusebius' work was suggested by this Harmony, as he tells us in his epistle to Carpianus. An inconvenient feature of Ammonius' work was that only the Gospel of Matthew could be read continuously, the sequence of the other Gospels being broken in order to bring their parallel sections into the order followed by Matthew. Eusebius, desiring to remedy this defect, constructed his work on a different principle. He made a table of ten canons, each containing a list of passages as follows: Canon I. passages common to all four Gospels; II. those common to Matthew, Mark, and Luke; III. those common to Matt, Luke, and John; IV. those Fabricius (Bibl. Gr. VI. 104) reports that the following works are extant in MS.: Fragmentum de Mensuris ac Ponderibus (MSS. Is. Vossii, n. 179); De Morte Herodis (MS. in Bibl. Basil.); Præfatio ad Canticum Mosis in Exodo (Lambec. III. p. 35).