Olympiacos Club of Fans of Piraeus, known simply as Olympiacos or Olympiacos Piraeus, is a Greek professional football club based in Piraeus, Attica. Their home ground is the Karaiskakis Stadium, a 32,115-capacity stadium in Piraeus. Founded on 10 March 1925, Olympiacos is the most successful club in Greek football history, having won 47 League titles, 28 Cups (18 Doubles) and 4 Super Cups, all records. Olympiacos is the most popular football club in Greece.