In Ancient Rome, victory agnomen is a honorific title used by a successful military commander to commemorate his victory. Examples including Macedonicus, Achaicus, Africanus, Asiaticus, etc.
However, I found it really strange that some great Roman generals and emperors never used it...
1. Pompey as Syricus, Ponticus, and Cilicicus
2. Caesar as Gallicus
3. Octavian as Aegypticus, Pannonicus, Moesicus, Hispanicus, Judaecus, and Galaticus
4. Claudius as Britannicus, Mauretanicus, Thracicus, and Lycicus
5. Trajan as Dacicus, Mesopotamicus, Assyricus, Arabicus, and Armenicus
Wouldn't it sounds cool in Ancient Rome if you have such a long name...?