The study analyzes the career of clarissimus L.Cossonius Gallus developed between Domitian, Nerva, Trajan Tea Lights and Hadrian.In particular, we analyze the charges under Trajan, including, in 111 AD, the proconsul of Sardinia.In the same year the proconsul L.
Cossonius Gallus by order of Trajan proceeded to constitutio of Forum Traiani in the center of Sardinia.Subsequently (113-115 AD) Cossonius became legatus Augusti in the provinciae of Galatia, Pisidia and Paphlagonia, was Nasal Spray consul suffectus in 116 AD, and around 120AD legatus provinciae Iudeae.