According to Falco of Benevento, Grimoald was a vir mirabilis et bellicosi spiritus and Orderic Vitalis calls him liberalem et strenuum virum.
Potrivit descrierii lui Falco de Benevento, Grimoald era un vir mirabilis et bellicosi spiritus, iar cronicarul Orderic Vitalis îl numește ca liberalem et strenuum virum.