A single piece of writing might occupy several scrolls. King Ptolemy II Philadelphus (309–246 BC) is said to have set 500,000 scrolls as an objective for the library. Mark Antony supposedly gave Cleopatra over 200,000 scrolls (taken from the great Library of Pergamum) for the library as a wedding gift. Carl Sagan, in his series , states that the library contained nearly one million scrolls, though other experts have estimated a smaller number. No index of the library survives, and it is not possible to know with certainty how large and how diverse the collection may have been. 