Osthathios Sleeba Of Arthat
18th and 19th-century Jacobite Syrian patriarch and saint

Mor Osthathios Sleeba (Syriac: ܡܪܝ ܐܘܣܛܬܝܘܣ ܨܠܝܒܐ, Malayalam: മോർ ഒസ്താത്തിയോസ് സ്ലീബാ) (1 January 1854 – 13 March 1930) was a Syriac Orthodox Metropolitan who served as the Syriac Orthodox Patriarchal Delegates of India. He is venerated as a saint by the Jacobite Syrian Christian Church.
His tomb is located at St. Mary's Simhasana Church in Kunnamkulam, Kerala. His feast day is celebrated annually on 19 March. Mor Osthathios Sleeba was officially canonised as a saint by the Syriac Orthodox Patriarch Moran Mor Ignatius Zakka I Iwas on 4 April 2000.
Biography
Early life and education
Sleeba was born on 1 January 1854 in Amid, Mesopotamia (modern-day Diyarbakır, Turkey). He pursued religious studies, learning theology and the Syriac language under the tutelage of Reverend Samuel Monk, the vicar of the Damascus Church.
Mission to Malankara
Sleeba arrived in Malankara Church (Kerala, India) in 1881 to assist the local church during a period of perceived theological conflict brought about by the activities of Protestant missionaries sponsored by CMS Missionaries. He served for eight years as a monk under Metropolitan Mor Athanasius Shemvun.
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