This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. Find sources: "326" – news · newspapers · books · scholar · JSTOR (June 2023) (Learn how and when to remove this message)

Year 326 (CCCXXVI) was a common year starting on Saturday of the Julian calendar. At the time, it was known as the Year of the Consulship of Constantinus and Constantinus (or, less frequently, year 1079 Ab urbe condita). The denomination 326 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.

• Emperor Constantine the Great travels to Rome to celebrate the 20th anniversary of his accession to power, but while en route at Pola he orders his older son, Crispus Caesar, to be executed, possibly on charges of adultery.^[1] Later, Fausta, second wife of Constantine I, is also executed by being suffocated or boiled in a hot bath.^[2]

• September 14 (traditional date) – Helena, mother of Constantine I, discovers the so-called True Cross and the Holy Sepulchre (Jesus's tomb) in Jerusalem. On her pilgrimage, which begins about this year, she pauses on the Aegean island of Patmos, where she is said to found the church of Panagia Ekatontapiliani.
• Helena tells Constantine that he must atone for executing his son and wife by building churches, and at about this date construction begins on Old St. Peter's Basilica, the first church on the traditional site of Saint Peter's tomb in Rome, and on the basilica of Golgotha on Calvary outside Jerusalem. He also commissions construction of the Church of the Nativity in Bethlehem (dedicated 339).
• Christianity is introduced to the Kingdom of Iberia (modern-day Georgia) by Saint Nino (approximate date).

• Constantius Gallus, Roman consul and statesman (d. 354)
• Murong Chui (or Daoming), Chinese general (d. 396)
• Procopius, Roman general and usurper (executed 366) (approximate date)

• Flavius Julius Crispus, son of Constantine I (b. 303)
• Flavia Maxima Fausta, Roman empress (b. 289)
• Licinius II, Roman consul and caesar (b. 315)
• Liu (or Xianlie), Chinese empress of Han Zhao