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Executions of Crispus and Fausta

Constantine had his eldest son Crispus seized and put to death by "cold poison" at Pola (Pula, Croatia) sometime between 15 May and 17 June 326. In July, he had his wife Empress Fausta (stepmother of Crispus) killed in an overheated bath. Their names were wiped from the face of many inscriptions, references to their lives were eradicated from the literary record, and their memory was condemned. Eusebius, for example, edited out any praise of Crispus from later copies of Historia Ecclesiastica, and his Vita Constantini contains no mention of Fausta or Crispus. Few ancient sources are willing to discuss possible motives for the events, and the few that do are of later provenance and are generally unreliable. At the time of the executions, it was commonly believed that Empress Fausta was either in an illicit relationship with Crispus or was spreading rumors to that effect. A popular myth arose, modified to allude to the Hippolytus – Phaedra legend, with the suggestion that Constantine killed Crispus and Fausta for their immoralities; the largely fictional Passion of Artemius explicitly makes this connection. The myth rests on slim evidence as an interpretation of the executions; only late and unreliable sources allude to the relationship between Crispus and Fausta, and there is no evidence for the modern suggestion that Constantine's "godly" edicts of 326 and the irregularities of Crispus are somehow connected.

Although Constantine created his apparent heirs "caesars", following a pattern established by Diocletian, he gave his creations a hereditary character, alien to the tetrarchic system: Constantine's caesars were to be kept in the hope of ascending to empire and entirely subordinated to their augustus, as long as he was alive. Adrian Goldsworthy speculates an alternative explanation for the execution of Crispus was Constantine's desire to keep a firm grip on his prospective heirs, this—and Fausta's desire for having her sons inheriting instead of their half-brother—being reason enough for killing Crispus; the subsequent execution of Fausta, however, was probably meant as a reminder to her children that Constantine would not hesitate in "killing his own relatives when he felt this was necessary".