Tzoumas was a Videssian priest of Phos. He led a mission to Halogaland during the reign of Stavrakios to convert the Halogai to Phos-worship. Along with the Videssian priests Nephon and Antilas, Tzoumas brought the Haloga Kveldulf, who had converted to Phos worship while a slave in Videssos. Tzoumas, Nephon, and Antilas were killed in their sleep by a sorcerous attack by Grimke Grankel's son.