Basil of Caesarea

Basil organised the Christian East. He wrote the rule that every Eastern monastery still uses, founded a complex of hospitals and shelters that became the prototype for Christian welfare, and at the same time fought the Arian controversy down to its details. He's the reason Eastern monasticism stayed inside the city rather than fleeing to the desert — a more sustainable model than Antony's. He died young (49). His brother Gregory of Nyssa and his friend Gregory of Nazianzus carried the work to Constantinople 381 and Trinitarian orthodoxy as we have it.