Eustache also known as Eustace or Eustase of Bourges or Autun where he originated, was a 6th-century priest who became bishop of Bourges.La Vie des saints composées ..., t.X, Paris, chez Jean-Thomas Herissant, libraire rue St Jacques, 1739, p.226.Les Petits Bollandistes, dans La vie des saints, t.X, p.248-254. He trained at the Abbey of Saint-Symphorien, Autun.
Eustache first became deacon and archdeacon of Autun,Martyrologe universel contenant le texte du Martyrologe romain..., Paris, 1709, chez Frédéric Léonard, impr. rue St Jacques à l'Ecu de Venise, p.663. was elected archbishop of Bourges, after the death of Severe Sulpice on 29 January 591 and was the 20th to occupy the episcopal see, he left to his successor Apolinaire.Histoire de l'Église d'Autun, à Autun chez P.P. Dejussieu, 1774, p.506. In Bourges the Roman Catholic Church honoured him as a saint on 31 December.Chronologie des saints, Paris, chez Jean de Nully rue Saint Jacques 1707, p.339.
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