Shammai, which is why Rabbinical Judaism has followed Hillel.

Shammai took an active part in the political and religious complications of his native land. Of a stern temperament, he cultivated the characteristic of firmness and strictness in law in contrast to the tireless patience which is said to have distinguished Hillel's approach. Once, when a gentile came to him and asked to be converted to Judaism (or Noahide monotheism as H. Falk argues)