Tanna of the second generation; contemporary of R. Ishmael and R. Akiba, with whom he often engaged in halakic discussions. He is often mentioned merely by the name "Ben Nanos." He acquired a high reputation on account of his intimate knowledge of Jewish civil jurisprudence; and R. Ishmael said that whoever wished to occupy himself with the study of this branch of the Law ought to learn from Simeon b. Nanos (B. B. 10:8). Several of Simeon's sayings bearing on civil law have been preserved (B. B. 7:3, 10:8; Sheb. 7:5), as well as some of his opinions on other halakic subjects (Bik. 3:9; Shab. 16:5; 'Er. 10:15; Giṭ. 8:10; Men. 4:3). Neither the names of his teachers nor those of his pupils are known.