君士坦丁大帝和伊里尼当政时期，塔拉息的前任君士坦丁堡牧首帕弗罗秘密地放弃了牧首职位，进入了一座修道院，并穿上了大圣衣（大天使圣衣）。当时在位的是艾琳和君士坦丁大帝。 在帕弗罗的建议下，作为元老和皇室参谋的塔拉息于公元787年被选为牧首。塔拉息很快升任牧首。塔拉息对正教信仰有着渊博的知识，且充满巨大的热忱。塔拉息接任牧首的职务是为了能够打击异端邪说，尤其是反对圣像破坏运动。在他担任牧首期间举行了第七次普世大公会议（公元783年，尼西亚）。会议上，反对圣像的一派被宣布为异端，并重新恢复了对圣像的尊崇。塔拉息对孤儿和穷人广施怜悯，为他们建造住所，分给他们东西吃。面对强大的权利，塔拉息会毫不犹豫地捍卫信仰和道德。当君士坦丁大帝废黜了马力亚皇后，并同另一妇人居住在一起的时候，他向塔拉息请求为他们的婚姻赐福。塔拉息不但没有为他们赐福，而是劝说他，之后又指责他，最后禁止君士坦丁大帝领取圣体血。在他去世之前，许多人都看见了塔拉息对魔鬼说：“我没有犯这个罪，也没有犯那个罪！”，直到他虚弱的舌头不能再说话为止，而后，他开始用手保护自己，将魔鬼驱走。当他离世的那一时刻，他的脸明亮如太阳。这位伟大的牧首于公元806年荣耀归主。他管理教会的时间长达22年零4个月。 
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