The Roots of Maxwell's A DynamicalTheory of the Electromagnetic Field. The formulation of Maxwell's equations completely defines the connection between the electric field and the magnetic field, definitively unifying electricity and magnetism and at the same time providing a theoretical synthesis of all the experimental phenomena connected to these areas. In his revolutionary 1864 memoir where J.C. Maxwell presented his equations, he cites a handful of scientists, which were at the basis of his Theory This book, in its first part, presents an insight on all these latter scientists, reconstructing the scientific network behind Maxwell's unification and, in the second part, focuses on the Italians in such a network: Ottaviano Fabrizio Mossotti and Riccardo Felici, with a further insight on the connections between Maxwell and Italy and, in particular, Tuscany.