On 12 October 1969 he was ordained bishop by Monsignor Henri Varin de la Brunelière.
He succeeded Monsignor Henri Varin de la Brunelière as Archbishop Emeritus of Fort-de-France and Saint-Pierre.
Being the youngest in Martinique to become archbishop in his diocese of origin at 41, he was also the first black person in France and all of French dependencies around the world in this position.
Monsignor Marie-sainte died peacefully at the age of 89 on the morning of Sunday 27 August 2017 in Sainte-Anne, Martinique (France).
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