|Emperor of the Roman Empire|
|Reign||late 316 – March 1, 317 (co-emperor with Licinius)|
|Died||After March 1, 317|
In the first civil war between Licinius and Constantine I, the latter won an overwhelming victory at the battle of Cibalae on October 8, 316. (some historians date it in 314), Licinius fled to Adrianople where, with the help of Valens, gathered a second army. There, early in December 316, he elevated Valens to the rank of Augustus, presumably in order to secure his loyalty. Much later, Licinius would use the same trick (with just as little success) in the second civil war with Constantine, by appointing Martinianus co-emperor.
After Licinius's indecisive defeat at Campus Ardiensis in later 316 / early 317, Constantine was still in the dominant position from which he was able to force Licinius to recognize him as the senior emperor, depose Valens and appoint their sons as Caesars. According to Petrus Patricius, he explicitly expressed his anger from the elevation of Valens by saying the following to the envoy of Mestrianus:
The emperor made clear the extent of his rage by his facial expression and by the contortion of his body. Almost unable to speak, he said, "We have not come to this present state of affairs, nor have we fought and triumphed from the ocean till where we have now arrived, just so that we should refuse to have our own brother-in-law as joint ruler because of his abominable behaviour, and so that we should deny his close kinship, but accept that vile slave  [ie Valens] with him into imperial college".
The peace treaty was finalized at Serdica on 1 March, 317 Whether it was part of the agreement is unknown, but Licinius also had Valens executed.
- A.H.M. Jones, J.R. Martindale, J. Morris, The Prosopography of the Later Roman Empire, Cambridge University Press, 1971, p.1119
- For the consensus on the new dating of the battle of Cibalae in 316, see D.S. Potter 2004, p.378, C. Odahl 2004, p.164. Also see W. Treadgold, A History of the Byzantine State and Society, Stanford University Press 1997, p.34, A.S. Christensen, L. Baerentzen, Lactantius the Historian, Museum Tusculanum Press, 1980, p.23
- See, for instance, A.H.M. Jones 1949, p.127 and Ramsay MacMullen, Constantine, Routledge, 1987, p.67
- A.H.M. Jones 1949, p.127
- Samuel N. C. Lieu, D. Montserrat 1996, p.57
- Petrus Patricius, Excerpta de legationibus ad gentes at N.C. Lieu, D. Montserrat, 1996 p.58
- "ευτελές ανδράποδον" in the original Greek text (J. P. Migne, Patrologia Graeca Cursus Completus, vol.113, col. 672)
- D.S. Potter 2004, p.378
- Anonymus Valesianus. Origo Constantini Imperatoris at The Latin Library
- Jones, Arnold, H. M. Constantine and the Conversion of Europe, The English University Press, 1949
- Lieu, Samuel N. C., Montserrat, Dominic. From Constantine to Julian: A Source History, Routledge, 1996. ISBN 0-415-09335-X (includes an English translation of Origo Constantini)
- Odahl, Charles M. Constantine and the Christian Empire, Routledge, 2004. ISBN 0-415-17485-6
- Potter, David S. The Roman Empire at Bay AD 180–395, Routledge, 2004. ISBN 0-415-10058-5
Valerius ValensBorn: Unknown Died: 317
Served alongside: Licinius