Shortly after taking possession of the diocese of Imola, Bishop Millini conducted a general visitation of the diocese, and then, on 12 and 13 April 1622, held a diocesan synod and had its Constitutions published.[5] He held a second synod on 15 May 1628, and again published the Constitutions.[6] He held a third synod in 1638.[7]
He redecorated the Episcopal Palace in Imola in a more elegant style, and built a country villa at Turano. He decorated the attached church.[8] He built a new church for the convent of the Capucines.[9] He admitted the Hermits of Saint Peter of Pisa into the diocese and gave them the Church of S. Giuseppe and the religious house next door.[10]
On a commission from Pope Urban VIII, he successfully mediated the differences between the Duke of Modena and the Duke of Parma. He also acted as quartermaster for the papal troops fighting in the duchy of Ferrara.[11]
Ferdinando Millini served as Bishop of Imola until his death on 13 June 1644.[12]
^Synodus diocesana Imolensis in Italia, sub Illistriss. et reverendiss. d. d. Ferdinando Millino, episcopo et comite, anno MDCXXII, die xij & xiij aprilis, adiecto in fine catalogo episcoporum Imolensis ecclesiae, de quibus memoria extat. Faventiae: typis Georgij Zarafallij MDCXXII (in Latin). Manzoni, p. 360.
^Decreta synodi dioecesanae Imolen., sub illiustriss. & reverendiss. d. d. Ferdinando Millino, episcopo & comite, anno Domini 1628, die 15 maij. Bononiae: apud Clementem Ferronium 1628.
^J. D. Mansi (ed.), Sacrorum Conciliorum nova et amplissima collectio, editio novissima, Tomus trigesimus sextuster (Arnhem-Leipzig: H. Welter 1924), p. 227 (in Latin). Zaccaria, p. 204.
^Manzoni, pp. 360-361. Zaccaria, Francesco Antonio (1820). Episcoporum Forocorneliensium series (in Latin). Vol. Tomus II. Imola: Beneccius. p. 202.
^Manzoni, p. 364: tum etiam cum ipsi uni militum annonae cura pro toto Ferrariae ducatu, saeviente inter Pontificem ac principes foederatos bello, ab eodem Urbano est demandata....