John XI bar Mawdyono, also known as Yuhanna Modyana, was the Patriarch of Antioch, and head of the Syriac Orthodox Church from 1130 until his death in 1137.
Prior to his ascension as patriarch, John was abbot of the Monastery of Dovair, near Antioch.
[1][2] John travelled to Turbessel, the capital of the County of Edessa, where he was consecrated as patriarch in the Latin church on 17 February 1130, with Joscelin I in attendance.
The former bishop of Segestan was offered the dioceses of Samosata and Samha, but the local Syriac Orthodox population rejected him and he subsequently joined the Knights Templar.
John resided at Kaysun, a town within the County of Edessa, and ordained three bishops.