The doctrinal underpinnings of the Orthodox Church were primarily the work of Saints Basil the Great (d. 378), John Chrysostum ‘the ‘golden mouthed’ (d. 407), and Gregory Nazianzus ‘the Theologian’ (d.389). These Church fathers were known as the ‘Three Hierarchs’, and opinion differed as to which was greatest. Their admirers fell into arguing and the schism was not resolved until they appeared in a vision before the bishop John of Euchaïta, stating, ‘We are one before God’. They called for a feast day on 30 January and promised to intercede collectively on behalf of those who honoured them. This icon would have been commissioned by the small kneeling donor depicted at lower left, an unusual and western element in an otherwise typical Greek icon of the subject.