Jacques Raymond de Grenier du Giron[1] (Saint-Pierre, Martinique, 28 June 1736 — Paris, 2 January 1803),[2][3][Note 1] was a French navy officer.
He is best known for discovering and exploring a new route between Île de France (Mauritius) and French India.
[8] On 1 November 1767, Grenier departed Brest as captain of the corvette Heure du Berger.
[9] When he arrived, the time was too far into the monsoon season to permit sailing to India, the governor of Isle de France sent him on a mission to Madagascar instead.
The expedition was originally intended to continue to Fort Dauphin, but a lack of provisions made it impossible to complete the mission.
Grenier nevertheless surveyed numerous natural harbours and rivers in the coast, and found sports suitable to establish slaving outposts.
In 1772, he sailed to Isle de France again on the frigate Belle Poule, along with Lapérouse and Saint-Haouen, and ferrying the new governor, Ternay.
[8] In October 1772, Belle Poule sailed North through the Second Nazareth Bank, West of Gratia, before turning towards the Seychelles and arriving at Mahé.
In July 1773, Grenier departed again, sailing West of the Nazareth Bank, East of Gratia and Praslin, before arriving at Pondichéry and Manila.