[1] Ottaviano completed his studies earning a doctorate in utroque iure in the University of Genoa.

[1] From 1637 he was Auditor General of the Apostolic Camera, i.e. the Chief Judge of the high court competent for civil, ecclesiastical and penal issues related to the Roman Curia as well as superintendent of the important College of Notaries.

As Auditor General on 26 September 1641 he issued an edict to inflict Excommunication to whichever people sided with Odoardo Farnese, Duke of Parma, so making the first formal move of the First War of Castro.

[3] On 12 January 1643 Raggi was appointed Bishop of Aleria in the island Corsica, at the time under the Republic of Genoa.

The episcopal consecration followed on 1 February in the Basilica di Santa Maria Maggiore by the hands of Giandomenico Spinola.