James E. Walters, David A. Michelson and Thomas A. Carlson, (eds.), "Gregory I, catholicos — ܓܪܝܓܘܪ ܩܕܡܝܐ " in last modified August 17, 2016, http://syriaca.org/person/514 Grigor I ܓܪܝܓܘܪ ܩܕܡܝܐ Gregory I, catholicos Gregory I Gregorius (Grigor) I, Katholikos http://syriaca.org/person/514 http://viaf.org/viaf/sourceID/SRP|person_514 http://www.csc.org.il/db/browse.aspx?db=SB&sL=G&sK=Gregory I&sT=keywords Cath. since 605. Grigor originated from Prat d-Mayshan. ca. 610 Ch. of E. L. Van Rompay Grigor I The Gorgias Encyclopedic Dictionary of the Syriac Heritage 183 A Comprehensive Bibliography on Syriac Christianity Gregory I Baumstark, Geschichte der syrischen Literatur mit Ausschluß der christlich-palästinensischen Texte 128 Ortiz de Urbina, Patrologia Syriaca 69