The incredible coincidence that surround the appearance of the messenger from Corinth and the shepherd was that he was both the messanger, and once he had been the shepard that found a baby on the woods near Thebes who he had helped, that baby happened to be Oedipus.
Explanation:
The messanger that was coming to tell Oedipus that his father Podipus was dead, was the same shepard that years ago found Oedipus abandoned. It was an incredible coincidence that he was giving a message to a man, that years ago he met as a baby.
Great Britain gained control of the Suez Canal in 1875 even though it did not finance or participate in its construction. Egypt found themselves in debt so they sold their shares of the Suez Canal to Great Britain.