Flavius Valerius Constantius I, also known as Constantius Chlorus ('Paleface'), was the father of Constantine the Great. Constantius divorced his first wife, Helena (mother of his son Constantine) and married Theodora, stepdaughter of Maximian. After having fought against Carausius, Constantius campaigned in Germany and was proclaimed Caesar in AD 293. He defeated Allectus in AD 296 and took control of Britain. In AD 305 Constantius succeeded as Augustus. He died at York the following year.

This post-reform radiate presents the typical portraiture belonging to the period of the tetrarchy. The portrait shows on the obverse Constantius wearing a close trimmed beard, a lined face, aquiline nose, and long arched eyebrows. The eyes and mouth are firm and a furrow runs across his forehead. The votive reverse type celebrates the vicennalia of the Augusti in AD 303.

Obv. Radiate bust of Constantius I facing right, FL. VAL. CONSTANTIVS. NOB. C.
Rev. VOT. XX within a laurel wreath.