Iustinianus is a Latin name derived from the late Roman and Byzantine imperial name Justinian, itself a Latin cognomen of the names Justin and Justus. The base element comes from the Latin word justus meaning “just, righteous.” History The best-known bearer in the broader historical sphere is arguably the Byzantine emperor Justinian I (c. 482–565), although the specific form Iustinianus was also used in the early 5th century AD. One notable individual was Iustinianus, a Roman magister militum in Gaul who died in 407 AD. He was an officer of the Western Roman army in Britain who supported the usurper Constantine III. After crossing into Gaul, he was appointed magister militum along with Nebiogastes. In the ensuing conflict with the forces loyal to Emperor Honorius, he fought against the general Sarus but was defeated and killed. Meaning: Just, righteousOrigin: Latin from Iustinus and ultimately IustusUsage: Medieval Latin, Roman and Byzantine historyNotable Bearer: Iustinianus, Roman military commander (d. 407)