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Theosebia, also known as Theosebia the Deaconess is a 4th century Christian leader recognized as a saint in the Eastern Orthodox Church. As a saint she is referred to as Blessed Theosebia the Deaconess.
Her life and identification is ambiguous: her years of birth and death are uncertain (probably subsequent to 381). However, she is thought to have played an important role in the church in Nyssa, where she was called diaconissa, the deaconess or wife of a deacon.
Gregory Nazianzen wrote a letter of condolence (Ep. CXCVII) on her death to Gregory of Nyssa in which Gregory Nazianzen mentioned "your sister Theosebia" and "true consort of a priest". Hither comes the ambiguity of her identification. Some historians supposed Theosebia was the wife of Gregory of Nyssa, others suppose she was one of his sisters like Macrina the Younger; if so, then Theosebia was the sister of Basil the Great as well. Others imagined that she was the wife of Gregory Nazianzen, but there is no evidence to show that he was ever married.
Gregory of Nyssa, unlike the other Cappadocian Fathers, was married according to his own testimony in his work On Virginity that he could not benefit from the subject of his own work. This combined with Nazianzen's statement that Theosebia was buried by Nyssa in the aforementioned letter suggest that she was indeed either Nyssa's wife or sister whose funeral he would have been obliged to oversee.ka:თეოზვა დიაკონისა