The sarissa or sarisa was a long spear or pike about 5 to 7 meters in length. It was introduced by Philip II of Macedon and was used in his Macedonian phalanxes as a replacement for the earlier dory, which was considerably shorter. These longer spears improved the strength of the phalanx by extending the rows of overlapping weapons projecting towards the enemy. After the conquests of Alexander the Great, the sarissa was a mainstay during the Hellenistic era by the Hellenistic armies of the diadochi Greek successor states of Alexander's empire, as well as some of their rivals.