Belsunce is a district near Canebière, central Marseille. Its name was given by Monseigneur Henri François Xavier de Belsunce de Castelmoron, who famously helped during the Great Plague of Marseille.
Belsunce is a popular area from the "Centre Bourse" to the big shopping crentre of central Marseille. It includes the famous Alcazar, an old theatre that has been converted into a library.
Wikipedia https://en.wikipedia.org/wiki/Belsunce
Coordinates 43°17'56.845" N 5°22'37.546" E