What is the origin of the Egyptian needle in St. Peter’s Square?
The mightiest Egyptian obelisk in the world stands in St. Peter’s Square, but until a relatively short time ago, a riddle surrounded the great needle. When it was erected in the center of a Rome arena where gladiators used to fight and charioteers raced, Emperor Caligula (whose reign ended in A.D. 41) had a Latin dedication to his mother (Agripina) engraved at the base of the obelisk. Then, almost 1,500 years later, Pope Sixtus V ordered the 320 ton monolith lugged from the ancient arena to its present position in St. Peter’s Square.
But where did the Egyptian needle come from? It bore no hieroglyphics or words of any kind anywhere, so it remained a mystery—until this century, when Professor Filippo Magi, an archeologist, began to wonder about the Latin inscription and why it had been carved on an indented rectangle and not directly on the surface of the obelisk. Then he looked more closely as the slanting rays of the sun hit in such a way as to reveal innumerable little holes, about a quarter of an inch deep, scattered among the Latin words. Could they possibly be what remained of holes that once held the teeth of bronze letters of a previous inscription, letters that Caligula ordered removed to make room for Latin words? Could the archeologist reconstruct the ancient letters just from the positions of the holes? With hundreds of plastic letters made to size, Professor Magi went to work—both guessing and using the principles of cryptography—to solve the puzzle. His detective work paid off. When he broke the riddle and the original inscription could be read, it revealed that the obelisk had been put up in Heliopolis by Caius Cornelius Gallus, a Roman prefect to Egypt who had erected many such monuments to his own glory before he fell into disfavor and committed suicide in 27 B.C.