Note 104
From Chapter 69 of the Decline & Fall

— Vallis te proxima misit,
Appenninigenæ quâ prata virentia sylvæ
Spoletana metunt armenta greges protervi.

Monaldeschi (tom. xii. Script. Ital. p. 533) gives the Ursini a French origin, which may be remotely true.