Important dates
1. The riveli lists land owned (with its general location), buildings, creditors, liabilities and even livestock. The Sicilian riveli were compiled from the mid-1500s until 1815
2. 1545 The Council of Trent, held in Trento, Italy (1545-1563), mandated the keeping of parish records for baptisms, marriages, and deaths.
3. The Italian Parish registries began in 1563 because of reforms proclaimed at the Council of Trent, although many parishes didn’t conform until much later.   We know of a few parishes who kept records as early as the 1300s. The church records of Palermo, for example, start about 1350, and the baptistry in Firenze has records from the early 1400s
4. 1630 and Beyond:
For the year 1630, and the 17th century in general, parish records offer a window into the lives of people in Italy, including details on demographics, family structures, and significant events. 
5. 1742. Regno d’Italia (not Sicily) Catasto Onciario.
6. 1809 Napoleon conquered All of Italy (except Sicily) and civil records were initiated
7. 1814 Napoleon was defeated and in the former Vatican States local civil records were often destroyed Second copy was already in State Archives so for the most part was preserved.
8. 1816 notation of baptism on birth records. Unfortunately, the details of the parish were not included just the date.
9. 1820 civil records were initiated in Sicily
10. 1820 new printed birth records include name of parish up to 1865
11. 1860. The Vatican States sold Benevento and Pontecorvo to Regno d’Italia
12. 1861 Garibaldi and the Piemontese united the various principalities and the Regno into ITALY. Civil records between 1861 and 1865 are often missing in the state archives from southern Italy but can often be found in the town records
13. 1866. Second copies of civil records are now sent to Tribunal.. Baptism information is no longer included. In some areas due to war or earthquakes, fire, etc. the second copies were transferred from the tribunal to the state archives and were included in the digitization. This is not common and is unlikely that civil records after 1866 will be published on the Antinati site but will be available on the family search site.
14. 1870. The Vatican States were united with Italy and civil records began for the entire area. You will find some parish records prior to 1870 conserved in the state archives as they were required by the civil authorities for tax purposes.
15. 1930. The Facists created the Province of Latin annexing towns from Rome, Caserta and Frosinone