Latin name (Constantinus) comes from the Latin word (constantis) means - "immutable; steadfast, firm; loyal".
The Roman emperor, Flavius Valerius Aurelius Constantinus (modern Constantine) I, was born at Naissus, in Upper Moesia. He was the eldest son of Constantinus Chlorus and Helena, and first distinguished himself as a soldier in Diocletian's Egyptian expedition (296), and then under Galerius in the Persian war. In 305 the two emperors Diocletian and Maximian abdicated, and were succeeded by Constantine Chlorus and Galerius. Constantine joined his father, who ruled in the west, at Boulogne on the expedition against the Picts, and before Constantinus died (306) he proclaimed his son his successor. Galerius did not wish to quarrel with Constantine, yet he granted him the title of Caesar only, refusing that of Augustus. Political complications now increased, until in 308 there were actually no less than six emperors at once - Galerius, Licinius and Maximin in the east, and Maximian, Maxentius his son, and Constantine in the west. Maxentius drove his father from Rome and Maximian committed suicide (309). Maxentius threatened Gaul with a large army. Constantine, crossing the Alps by Mont Cénis, defeated Maxentius, who was drowned after the last great victory at the Milvian Bridge near Rome (312)