Wikipedia
Naucratius
Saint Naucratius was the son of Basil the Elder and Emmelia of Caesarea. He had distinguished himself both in scholarship and Christian devotion, as an active hermit, a living example for his famous brothers, Basil and Gregory of Nyssa. The citation below states he was the second of four brothers, but another Wikipedia article here on the Cappadocian Fathers claims Naucratius was the eldest of the siblings, including 3 brothers and one sister. Clarification needed.