Sotion of Alexandria (fl. c. 200 BC – 170 BC) was a Greek doxographer and biographer, and an important source for Diogenes Laërtius. None of his works survive; they are known only indirectly. His principal work, the Διαδοχή or Διαδοχαί (the Successions), was one of the first history books to have organized philosophers into schools of successive influence: for example, the so-called Ionian school of Thales, Ana… (More on Sotion)