Could we for consistency and for the look of it, add house to the Kingdom of Italy?
In short, add the House of Savoy. Thank you :)
Like so:
House of Savoy:
- Vittorio Emanuele II (1861-1878)
- Umberto I (1878-1900)
- Vittorio Emanuele III (1900-1946)
Republic (1946-date)
Source: