卡里斯托斯是西奈的格里哥利的门徒，他在圣山阿托斯的菲罗特乌修道院中的马郭拉小修道院中修行长达28年的时间。后来，他修建了圣马马斯修道院。1350年，卡里斯托斯被选为君士坦丁堡牧首。四年之后，他离开牧首职位重返圣山阿托斯。在约安·帕雷奥罗古斯在位期间他又成为牧首，直至去世为止。1368年，圣卡里斯托斯死在前往塞雷斯的路上，他要到那里会见塞尔维亚女皇艾莱尼，女王寻求圣人的帮助以抗击土耳其人。圣卡里斯托斯同伊格纳提共同编写了一本有关修行的书。除此之外，他还书写了西奈的圣格里哥利和特尔诺夫的圣德奥多西的圣人传记以及大量的讲道。一件奇妙的事情就是：卡帕索卡里维亚的圣玛尔克西姆斯预言了牧首圣卡里斯托斯的死亡。在前往塞尔维亚的路上，卡里斯托斯通过圣山阿托斯。圣玛尔克西姆斯看到他后说："这位长老再也不会看到他的信众，因为在他的身后传来了葬礼的歌声：'行为完全、遵行上主律法的，这人便为有福'"（圣咏119：1）。 
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