Leone (or Leo) was the first magister militum (master of the soldiers), serving one year in 737. Otherwise, nothing is known about him.
The account of the election of the first three doges of Venice (Pauluccio, Marcello and Orso), from the anonymous “Chronicon Altinate”.
The first doges, from the “Chronica per extensum descripta” (1340s) by Andrea Dandolo.