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To them, the Trinity was a “Greek philosophical invention” that complicated the simple monotheism they found in the scriptures.

The “Arian Era” was ended abruptly by Theodo-sius I (Theodosius the Great) in 379 CE. He was a hardcore Trinitarian. He issued the Edict of Thessalonica, which made Trinitarianism the only legal religion of the Empire.

30 https://muze.gen.tr/muze-detay/ayasofya