Gabriel I of Constantinople (; died 1596) was Ecumenical Patriarch of Constantinople from March to August 1596. He was previously bishop of Thessaloniki.Dates according to Venance Grumel, Traité d'études byzantines, vol. I - La chronologie, Presses universitaires de France, Paris, 1958, p. 438.
Notes and references
Bibliography Venance Grumel, Traité d'études byzantines, vol. I - La chronologie, Presses universitaires de France, Paris, 1958. Nicolas Viton de Saint-Allais, L'art de vérifier les dates, tome I, Paris, 1818, p. 494.