Lyman, Rebecca. 2024. 'The Theology of the Council of Nicaea', St Andrews Encyclopaedia of Theology. Edited by Brendan N. Wolfe et al.
The Council of Nicaea in 325 was a critical theological and institutional watershed between the local and often diverse theologies of one God as Trinity in the second- and third-century Christian communities and the universal or catholic credal statements of the ancient imperial church that developed over the course of the fourth century.