- John of Mar Sabas
Monk at the eremetical abbey (a laura) of Saint Sabas’ near Jerusalem. Martyred with 20 other monks in an Arab anti–Christian raid during which many others were injured but escaped; one of them, named Stephen, wrote a poem in honour of the group known as the Martyrs of Mar Sabas.
- Book of Saints, by the Monks of Ramsgate
- Catholic Online
- Our Sunday Visitor’s Encyclopedia of Saints
- “Saint John Sergius“. CatholicSaints.Info. 20 March 2012. Web. 25 August 2016. <>