▁Despite ▁being ▁a ▁fer vent ▁anti - union ist , ▁he ▁was ▁sent ▁by ▁the ▁By z antine ▁em peror ▁Manuel ▁II ▁Pal ai olog os ▁( re igned ▁ 1 3 9 1 – 1 4 2 5 ) ▁to ▁particip ate ▁in ▁the ▁discuss ions ▁for ▁a ▁pros pective ▁union ▁with ▁Pope ▁Urban ▁VI ▁( 1 3 7 8 – 8 9 ). ▁The ▁mission ▁achieved ▁some ▁success , ▁but ▁with ▁no ▁firm ▁commit ments ▁on ▁either ▁side , ▁and ▁on ▁his ▁return ▁to ▁Constantin ople ▁he ▁was ▁promoted ▁to ▁arch im and rite ▁and ▁became ▁ab bot ▁of ▁the ▁pr estig ious ▁St oud ios ▁Mon aster y . ▁ ▁Event ually ▁E uth ym ius ▁advanced ▁to ▁the ▁post ▁of ▁prot os yn k ell os , ▁after ▁which ▁he ▁became ▁Patri arch ▁of ▁Constantin ople . ▁During ▁his ▁ten ure , ▁he ▁endeav oured ▁to ▁remove ▁the ▁Church ▁from ▁imperial ▁control ▁and ▁act ▁autonom ously . ▁Of ▁his ▁writ ings , ▁only ▁a ▁philosoph ical ▁treat ise ▁" On ▁being ▁and ▁not ▁being " ▁and ▁two ▁letters ▁surv ive . ▁E uth ym ius ▁II ▁died ▁on ▁ 2 9 ▁March ▁ 1 4 1 6 . ▁ ▁References ▁▁ ▁Category : 1 3 4 0 s ▁birth s ▁Category : 1 4 1 6 ▁death s ▁Category : 1 4 th - century ▁By z antine ▁mon ks ▁Category : E c umen ical ▁Patri arch s ▁of ▁Constantin ople ▁Category : 1 5 th - century