The wars of the Diadochi are a very intriguing episode in Greek history, which doesn't get as much recognition, as it deserves. After the death of Alexander the Great his most trusted advisors and generals struggled for hegemony over his vast empire, which he left behind without naming an successor. Over almost half a century, they were plotting against each other, ordered assassinations, or flat out waged war, always looking to extend the area of influence they had left. In the end, the political landscape stabilized, and the dynasties of the Antigonids in Macedonia, the Ptolemies in Egypt, and the Seleucids in Syria, emerged from the conflict.
Today I discovered a youtube channel covering this part of Greek history in short videos. Here is the link to the first one.