Luigi Moraldi

The Acts of Thaddeus is a Christian document, likely originating in the seventh century CE or later, that recounts a purported correspondence between King Abgar V of Edessa and Jesus. This exchange leads to Jesus' disciple Thaddeus traveling to Edessa, where he reportedly performs miracles, including healing the king. Scholars generally view it as a later development of the Abgar legend, first told by Eusebius, and distinct from the Syriac Doctrine of Addai.

Scholarly dating places the text between 544 and 944 CE, with some suggesting the eighth-century iconoclasm controversy as a relevant context. The work places significant emphasis on the miraculous nature of the Image of Edessa, downplaying the role of human figures. While considered doctrinally orthodox, its historical accuracy is questioned, with suggestions that the author may have conflated the apostle Thaddeus with another figure named Addai. The Acts of Thaddeus was included in the biblical canon of Gregory of Tatev, and its descriptions of initiation sacraments are of interest to modern scholars. It is also studied by those linking the Image of Edessa to the Shroud of Turin, though such interpretations are considered biased.

Most scholarly consensus places the composition of the Acts of Thaddeus no earlier than the seventh century CE. Some researchers have proposed specific date ranges, such as between 609 and 944 CE, coinciding with the transfer of the Image of Edessa to Constantinople. Other estimates point to the seventh century, with a more specific proposal of 629-630 CE, though this has met with scholarly disagreement. The eighth-century iconoclasm controversy is also considered a likely contextual backdrop for the text. It is important to distinguish the Greek Acts of Thaddeus from the Syriac Doctrine of Addai, as these texts are frequently confused. The Acts of Thaddeus is understood as an evolution of the Abgar tradition previously presented by Eusebius.

The narrative within the Acts of Thaddeus centers on a correspondence between King Abgar V of Edessa and Jesus. Following this exchange, Jesus' disciple Thaddeus is depicted as traveling to Edessa, where he engages in miraculous activities, including the healing of King Abgar. The text represents a significant advancement in the Abgar tradition compared to earlier versions like the Doctrine of Addai. It amplifies the miraculous qualities attributed to the Image of Edessa while diminishing the importance of human agency in the events described. While considered doctrinally sound, the work is not concerned with historical exactitude. Some scholars suggest the author may have mistakenly identified the apostle Thaddeus with a different Syrian Christian figure named Addai.

The Acts of Thaddeus found a place within the biblical canon of Gregory of Tatev, despite the absence of any biblical manuscripts containing it. Modern academic study highlights its value for its detailed descriptions of the sacraments associated with initiation. The text is also relevant for individuals researching connections between the Image of Edessa and the Shroud of Turin; however, such interpretive efforts are viewed as biased by some scholars. In recent times, the Acts of Thaddeus has served as inspiration for creative works, including a 2014 film script titled "The Acts of the Apostle Thaddeus: The Birth of Christianity in Assyria."