Robert discusses how the teachings about the Trinity split the early church. 

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Extra Notes:

Much of the history of what was covered can be found in Eusebius of Caesarea’s (AD 260s-339) Ecclesiastical History. Thank you Mr. George Roberts for raising this question. Much of our knowledge of Constantine also comes from the EH. It is very lengthy but can be found online in its entirety at https://www.newadvent.org/fathers/2501.htm. A hard copy is available at https://a.co/d/1eU137j.

The history of the 12 apostles is included in the EH but is also digested here: https://www.goarch.org/-/the-basic-sources-of-the-teachings-of-the-eastern-orthodox-chur-1. Please be advised that the descriptions of their martyrdoms are graphic.

A summary of the seven ecumenical councils is available here: https://www.saintjohnchurch.org/quick-facts-7-ecumenical-councils/. A full English translation is available here: https://archive.org/details/sevenecumenicalc00perc/page/n7/mode/2up. Thank you Mr. Rex Thompson for raising this question!

The beliefs of Arius Robert read from can be found here: https://www.fourthcentury.com/arius-thalia-greek/. A version of Athanasius of Alexandria’s creed in response to Arius can be found here: https://www.rca.org/about/theology/creeds-and-confessions/the-athanasian-creed/.

Robert closed by mentioning an 8th-century Latin hymn titled “Ubi Caritas." The text can be found here: https://www.preces-latinae.org/thesaurus/Hymni/UbiCaritas.html. An audio version of the hymn can be heard here: https://www.youtube.com/watch?v=ej8VvT3g2MA. We recommend listening while following the text.