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| Council of Ariminum (359) | |
|---|---|
| Name | Council of Ariminum (359) |
| Location | Ariminum |
| Date | 359 |
| Convoked by | Constantius II |
| Attendance | bishops from Italia, Illyricum, Pannonia |
| Major issues | Arianism, Homoousios, Homoiousios, Athanasius of Alexandria |
Council of Ariminum (359) The Council of Ariminum (359) was a synod held at Ariminum under the authority of Constantius II amid the fourth‑century controversies over Arianism, Nicene Creed formulations, and episcopal authority. The assembly became a focal point in disputes involving figures such as Eusebius of Nicomedia, Ursacius of Singidunum, Valens of Mursa, and opponents linked to Athanasius of Alexandria and Hilary of Poitiers. Its decisions and the surrounding maneuvers influenced subsequent councils including Seleucia (359), Sirmium (357), and the later Council of Serdica.
In the 350s the Roman Empire under Constantius II faced theological division arising from the legacy of Athanasius of Alexandria and the formulations of the First Council of Nicaea. Debates between proponents of Homoousios and Homoiousios were entangled with power struggles among bishops tied to sees like Antioch, Alexandria, Rome, and Constantinople. Imperial involvement by Constantius II and court figures such as Eusebius of Nicomedia sought to produce concord between parties represented at regional synods like Sirmium (357) and the eastern assemblies at Seleucia (359), precipitating a western synod at Ariminum.
Constantius II convoked the synod to reconcile western bishops with eastern decisions after the contentious gatherings at Seleucia (359) and Sirmium (359). The explicit aim was to secure acceptance of a creed formulated to exclude the term Homoousios while addressing accusations against exiled bishops such as Athanasius of Alexandria and Marcellus of Ancyra. Imperial envoys and commissioners, influenced by court allies like Eusebius of Nicomedia and Valens of Mursa, pressed for signatures to a compromise creed modeled on the Sirmian formulary.
Principal figures included western prelates and imperial representatives: bishops from Italia such as Jovius of Trent and Fortunatianus of Aquileia, eastern advocates like Eusebius of Emesa and Ursacius of Singidunum, and influential supporters of imperial policy including Arintheus and commissioners loyal to Constantius II. Opponents in the west who resisted the imperial compromise were connected with supporters of Athanasius of Alexandria, including Hilary of Poitiers, members of the Roman clergy allied with Damasus I, and bishops sympathetic to the memory of Nicholas of Myra‑era Nicene orthodoxy. The papal stance of Liberius and the interventions of metropolitan sees such as Milan and Ravenna shaped local alignments.
Debates at Ariminum centered on the theological language used to describe the relationship between Jesus and God the Father, with specific contention over Homoousios, Homoiousios, and terminologies advanced by Arianism proponents. The council was notable less for extended theological disputation than for political pressure: many attending bishops signed a creed similar to the Sirmian Creed after receiving imperial instruction, while a minority refused on grounds of fidelity to the Nicene formula from Nicaea. Canons asserted episcopal procedures, addressed the status of exiles like Athanasius of Alexandria, and attempted to regularize communion between sees such as Antioch and Alexandria. The resulting document, often described as ambiguous, employed terminologies influenced by Eusebius of Nicomedia and the theological trajectory of the Arian controversy.
The decisions at Ariminum intensified fractures within the western episcopate, provoking responses from figures such as Hilary of Poitiers and energizing the remonstrances of Pope Liberius. The council’s acquiescence to imperial pressure contributed to the temporary marginalization of staunch Nicene supporters and set the stage for later synods including Sirmium (360s) and the eventual rehabilitation of Nicene theology at the Council of Constantinople (381). Politically, the event illustrated Constantius II’s use of ecclesiastical councils to consolidate religious policy across provinces like Illyricum and Pannonia, and it affected careers of bishops such as Ursacius of Singidunum and Valens of Mursa.
Contemporary accounts derive from polemical writers including Athanasius of Alexandria’s letters, the treatises of Hilary of Poitiers, and chroniclers like Socrates Scholasticus, Sozomen, and Theodoret of Cyrrhus. Imperial correspondence and episcopal letters preserved in collections linked to Gregory of Nazianzus and Basil of Caesarea supply additional perspectives. Modern historiography debates the council’s representativeness and the sincerity of episcopal assent, with scholars referencing works on Fourth Ecumenical Council controversies, the careers of Eusebius of Nicomedia, and analyses of imperial theology under Constantius II.
Category:4th-century church councils Category:Arian controversy