Domnius is a Latin name derived from Domnus, which itself originates from the Vulgar Latin domnus, a contracted form of the Latin dominus meaning "lord, master".Historical and Religious SignificanceThe name Domnius is primarily associated with Saint Domnius, a 3rd-century bishop of Salona (near modern-day Split, Croatia). According to tradition, he was martyred during the persecutions of Diocletian in the early 4th century. After his death, his relics were eventually enshrined in the Cathedral of Split, which was originally built as a mausoleum for the Roman emperor Diocletian. Later conversion of the mausoleum into a cathedral dedicated to Saint Domnius made it the oldest Catholic cathedral in the world still in use in its original structure.Over time, Saint Domnius became the patron saint of Split, and his feast day (April 11) remains an important local holiday.Linguistic and Cultural VariantsIn Croatian, the name appears as Dujam and its hypocoristic form Duje. The popularity of the name in Croatia is largely attributed to the veneration of Saint Domnius.Meaning: "lord, master"Origin: Latin (via Domnus)Type: Given nameUsage region: Medieval Latin, Croatia