Beginning from the group called the Alpi della Luna near the sources of the Tiber, which attain 4435 ft., they are continued by the Monte Nerone (5010 ft.), Monte Catria (5590), and Monte Maggio to the Monte Pennino near Nocera (5169 ft.), and thence to the Monte della Sibilla, at the source of the Nar or Nera, which attains 7663 ft.
The Nera, which rises in the lofty group of the Monte della Sibilla, is a considerable stream, and brings with it the waters of the Velino (with its tributaries the Turano and the Salto), which joins it a few miles below its celebrated waterfall at Terni.
His wife Sibilla indeed maintained a regency for her second son William III., but on Henry's final descent, Naples surrendered almost without a blow in May 1194, and the rest of the Regno followed.
Sibilla and the loyal Margarito prepared to defend Palermo, but the citizens admitted the emperor on the 20th of November 1194.
His principal works are Le Cene (1756), a collection of stories in the manner of Boccaccio, and a number of prose comedies, La Gelosia (1568), La Spiritata (1561), I Parentadi, La Arenga, La Sibilla, LaPinzochera, L'Arzigogolo.