Robert Guérin du Rocher was born in Repas in 1736. He was the younger brother of Petrus and like his brother became a Jesuit priest.
He did missionary work in the Middle east and eventually settled as a pastor in Salonika, before being expelled by the Ottomans. On returning to France he bacmae spiritual director for the Sisters of the Visitation in Paris.
On 2 September 1792 he was one of the priests, along with his older brother Petrus killed by a mob in the September Massacres. 134 years later he and his fellow Holy September Martyrs were beatified by Pope Pius XI in October 1926Martyrologium Romanum, 2004, pp. 492–493
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