Colonus is the place where Oedipus and his daughter stop to rest in "Oedipus at Colonus" by Sophocles (495 B.C.E. - 405 B.C.E.).
Specifically, disgraced former Theban King Oedipus is in exile from his hometown of Thebes. His daughters, the Princesses Antigone and Ismene, keep him company, because they want to and because Oedipus is blind. The news of Oedipus' downfall precede the trio and therefore make them unwelcome. But they stay in Colonus, because Oedipus remembers the prophecy that a place sacred to the Furies will be his death place and Colonus is that place.