Nicene Creed

statement of belief adopted at the First Ecumenical Council in 325

11 dated entries naming Nicene Creed, drawn from 11 separate years between 325 CE and 1274 CE. Nothing here is written by us: each line is the sentence a Wikipedia year article used, and the link beside it opens the exact revision.

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4th century

325May 20 – First Council of Nicaea: Constantine summons an ecumenical council of bishops in Nicaea (Turkey). The Nicene Creed, adopted on June 19, declares that the members of the Trinity (the Father, the Son, and the Holy Spirit) are equal. The council decides that Easter is celebrated on the first Sunday after the first full moon after the vernal equinox. Arius is exiled to Illyria; his works are confiscated and consigned to the flames.source
357Late in the year Pope Liberius travels to Sirmium (Pannonia) and agrees to sign documents that effectively undo the Nicene Creed (which implicitly disavows Arianism) and to sever his relationship with the former Alexandrian patriarch Athanasius, who is replaced as patriarch of Alexandria by his Arian opponent George of Cappadocia.source
381First Council of Constantinople (some authorities date this council to 383): Theodosius I calls a general council to affirm and extend the Nicene Creed, and denounce Arianism and Apollinarism. Most trinitarian churches consider this an Ecumenical council.source
383First Council of Constantinople (some authorities date this council to 381): Theodosius I calls a general council to affirm and extend the Nicene Creed, and denounce Arianism and Apollinarism. Most trinitarian Christian churches consider this an Ecumenical council.source
393Theodosius I abolishes the Greek Olympic Games, ending a thousand years of festivals, as part of the general Christian policy to establish universal Christian worship in accordance with the doctrines set forth in the Nicene Creed (the next Olympic Games will not be held until 1896).source

5th century

410Council of Seleucia: Persian Christians create a national church and adopt the Nicene Creed.source
431June – First Council of Ephesus: Nestorianism is rejected; the Nicene Creed is declared to be complete. Nestorius is deposed from his see.source
447The Synod of Toledo (Spain) tries to add the filioque clause to the Nicene Creed. The Eastern Orthodox Church refuses to go along with this idea.source

6th century

587The filioque clause is first used in the Nicene Creed, against the Arians in Visigothic Spain (approximate date).source

11th century

1014The Nicene-Constantinopolitan Symbol of the Faith is used for the first time during the Roman Mass, after Henry II, the newly crowned Holy Roman Emperor, asks the Pope to add it – together with the filioque clause. Prior to this date, the Creed has not been used at all during the liturgy.source

13th century

1274May 7 – Second Council of Lyon: Pope Gregory X convenes a council at Lyon, after Byzantine Emperor Michael VIII Palaiologos gives assurances that the Orthodox Church is prepared to reunite with Rome. The council agrees to a settlement between the Catholic Church and the Orthodox Church over several key issues – Orthodox acceptance of papal primacy and the acceptance of the Nicene Creed with the Filioque clause. Gregory approves a tithe to support efforts to liberate the Holy Land from Muslims, and reaches apparent resolution of the schism, which ultimately proves unsuccessful. All but four mendicant orders of friars are suppressed. Catholic teaching on Purgatory is defined for the first time.source