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