Who were the diadochi? what did they do immediately after alexander's death? answers?

The successors of Alexander the Great were called Diadochi. During the first 50 years after Alexander's death they fought a series of wars, named Wars of the Diadochi. The situation was stabilised more or less after the Battle of Ipsus. There were 4 main successor states. From Hellenistic period, I quote: The Antigonid dynasty in Macedon and central Greece; The Ptolemaic dynasty in Egypt based at Alexandria; The Seleucid dynasty in Syria and Mesopotamia based at Antioch; The Attalid dynasty in Anatolia based at Pergamum.