The name "Ballomar" can be broken down into two Celtic elements, ballo- meaning "limb, member" (cf.
Gaulish ballos Irish ball), and maro meaning "great" (cf.
[1];[2];[3] Ballomar is first mentioned by Cassius Dio as conducting peace talks with the governor of Pannonia Superior, Marcus Jallius Bassus, following the breakthrough of the limes by his allies the Germanic Lombards and Ubii.
Ballomar led the great invasion of Italy by a coalition of Celtic and Germanic tribes in 167-170 AD, which was the first time a hostile force had entered Italy since the Cimbri of Boiorix during the Cimbrian War.
Ballomar defeated a force of 20,000 Roman soldiers near Carnuntum, destroyed Opitergium (Oderzo) and besieged Aquilea.