Constantine II (Latin: Flavius Claudius Constantinus; February 316 – 340) was Roman emperor from 337 to 340. Son of Constantine the Great and co-emperor alongside his brothers, his attempt to exert his perceived rights of primogeniture led to his death in a failed invasion of Italy in 340.
Constantine was the eldest son of Emperor Theophilos and Theodora. He had five sisters (Thekla, Anna, Anastasia, Pulcheria, Maria). As Theophilos succeeded his own father Michael II as basileus on 2 October 829, Constantine became heir to the throne. Soon afterwards he was crowned co-emperor and he appears as such on the coins of his father.