Born into a very well off family, Rostan was a Southerner endowed with an inquisitive mind, a philanthropist with multiple gifts, co-founder of the Society of Christian Morals in 1821.
He was also a transatlantic voyager and the French consul in Havana from 1825 to 1827.
He discovered his calling as a Baptist evangelist late in life.
Arriving from America, after training as a pastor at the Baptist Seminary in Newton (1829), he unceasingly worked in Paris (preaching, lectures, etc.), a city which was practically a terra incognita for Baptists, from November 1832 to December 5, 1833, and contacted notably La Fayette and the circles of high society.
He didn’t have the time to consolidate these fragile beginnings as his life was taken in the cholera epidemic which hit Paris in 1833.