Constantius Chlorus (250-306) was born into a noble framily from Dardania descended from emperors Claudius II and Quintillus. Constantius joined the Roman army and served under various emperors, eventually being elevated to junior co-emperor alongside Galerius in 293, forming the Tetrarchy. In 305, Diocletian and Maximian abdicated, elevating Constantius and Galerius to joint emperors. Constantius was fighting the Picts in Britain beyond the Antonine Wall when the declaration came, but he died suddenly a year later in Eboracum (York). His death led to the collapse of the Tetrarchy. His son would become Constantine the Great, and therefore Constantius was considered the founder of the Constantinian Dynasty.