Porphyry repeats an account from Antiphon, who reported that while still on Samos, Pythagoras founded a school known as the “semicircle.”
The Vienna Circle (German: Wiener Kreis) of logical empiricism was a group of elite philosophers and scientists drawn from the natural and social sciences, logic, and mathematics. They met regularly from 1924 to 1936 at the University of Vienna, chaired by Moritz Schlick. The Vienna Circle had a profound influence on 20th-century philosophy, especially philosophy of science and analytic philosophy.
The Bloomsbury Group, or Bloomsbury Set, was a group of English writers, intellectuals, philosophers, and artists in the early 20th century. Among its members were Virginia Woolf, John Maynard Keynes, E. M. Forster, Vanessa Bell, and Lytton Strachey.
The Pre-Raphaelite Brotherhood (PRB), later known as the Pre-Raphaelites, was a group of English painters, poets, and art critics. Founded in 1848 by William Holman Hunt, John Everett Millais, Dante Gabriel Rossetti, William Michael Rossetti, James Collinson, Frederic George Stephens, and Thomas Woolner, they formed a seven-member “Brotherhood” partly modeled on the Nazarene movement.