He sponsored many building projects throughout Gaul during his tenure as emperor of the West, especially in Augustodunum (Autun) and Arelate (Arles).
Konstantinus memprakarsai banyak proyek bangunan di seluruh Galia selama masa jabatannya sebagai kaisar Barat, khususnya di Augustodunum (Autun) dan Arelate (Arles).