Licinius II, also called Licinius Junior or Licinius Caesar (Latin: Valerius Licinianus Licinius; – ), was the son of the Roman emperor Licinius I. He held the imperial rank of caesar between March 317 and September 324, while his father was augustus, and he was twice Roman consul. After losing a civil war, his father lost power and both he and Licinius the Younger were eventually put to death. Family and background Licinius I married Flavia Julia Constantia, daughter of the augustus Constantius Chlorus and half-sister of the augustus Constantine I. They wed at Mediolanum (Milan) in February 313. Three years later, Constantine attacked Licinius in the Cibalensean War. Constantine defeated Licinius at the Battle of Cibalae at Cibalae (Vinkovci) in Pannonia Secunda on the 8 October 316 and again at the Battle of Mardia near Hadrianopolis in Haemimontus (Edirne). Life Licinius II, son of Licinius, grandson of Constantius I, and half-nephew of Constantine, was born to Flavia Julia Constantia in July or August 315. While the augustus Licinius marched against Constantine in 316, Licinius II was left with his mother and the augustus's treasury at Sirmium (Sremska Mitrovica). After Licinius was defeated by Constantine at the Battle of Cibalae, and lost two thirds of his army, he fled to Sirmium and thence to Singidunum (Belgrade), where he crossed the river Sava and destroyed the bridge to delay Constantine's pursuit of him. With this delay, Licinius and his family reached Hadrianopolis. After Constantine reached Philippopolis (Plovdiv), and after he and Licinius failed to come to terms over Licinius's appointment of Valerius Valens as co-augustus, the Battle of the Mardia (or "of Campus Ardiensis", probably Harmanli) ensued, in which Licinius was again defeated. Licinius failed to flee towards Byzantium (Istanbul) as expected, and outmanoeuvred Constantine by marching to Beroea (Veria) while Constantine continued to Byzantium, this placed him across Constantine's lines of communication and supply. Additionally, Licinius captured Constantine's baggage train. As a result, Licinius and Constantine made peace: excepting the dioecesis of Thrace, all the territory formerly administered by Licinius in the Balkans was ceded to Constantine's control. Constantine was to be recognized as senior augustus, and all Licinius and Constantine's sons were to be mutually recognized as caesares. Caesar On the 1 March 317 Licinius II was raised to the imperial rank of caesar by agreement between his father and Constantine. Constantine's sons Crispus and the infant Constantine II