"Structural Conditions for Murderous Family Infighting
These are not just really bad people; the structural conditions in which they live are conducive, not to love and family solidarity, but to family jealousies and strife. To briefly list the conditions:
-- Marriages are typically arranged as political and diplomatic alliances. The women have no choice in who they marry; rulers regularly offer a daughter, or sister, to gain an ally or buy off a foe. This is an attractive deal on the receiving side, since the children of such a marriage have a claim to the succession of the family state they came from-- not that they will automatically succeed to the throne, since there are probably other candidates, but it is a good investment. And sons too sometimes are used by their fathers in the same fashion, or pawned as hostages. This means young persons of high rank normally expect they will go to live among people they do not really trust; on the other hand, people don’t trust each other that much where they grew up (among other reasons because most people are married to someone they didn’t choose), and there are good opportunities for personalities who develop the skills to plot and manipulate. Some women (for instance, Queen Olympias, Alexander’s mother, who plays a major political role when he is away and after his death) can become quite powerful by playing the game. If women are pawns, they also have close access to the networks of power, and network opportunity is more important than abstract cultural definition of status.
-- Love has nothing to do with marriage. But the term love does exist; we read in the ancient sources that Philip fell in love with the daughter of his general Attalus, and decided to throw off his political-alliance wife in her favor. Later Alexander will choose a wife, Roxane, who he finds captivating beautiful and falls in love with her during his conquests in central Asia; it doesn’t hurt that her father is an important chieftan and the marriage cements an alliance. On the other hand, it does not prevent Alexander, after returning to the Persian capital at the end of his conquests, from arranging a mass wedding of thousands of his soldiers to Persian wives, he himself taking a daughter of the conquered Persian King. (Roxane is still around, and she is still considered mother of the legitimate heir.) Falling in love had more or less the superficial meaning it has today, being smitten by someone’s beauty or sexual charm. We hear about Alexander’s soldiers who want leave to go back to Greece because they are in love with a courtesan; and one of Alexander’s most important generals, Ptolemy, sends for a famous courtesan from Athens to entertain them in Persia; she becomes his mistress and bears him several children, while he becomes King of Egypt.
This shows a way that ordinary women could rise in social rank. Although only women from royal families could play marriage politics, women who were beautiful and accomplished could make themselves so attractive that powerful men would fall in love with them, and even marry them. They were courtesans-- prostitutes; but exclusive enough so that they had to be courted. It was not a pathway that would be open to middle-class women of respectable families, who were closely guarded, even locked up at home; but courtesans who learned the arts of allurement had an arena where they could meet men of the highest rank-- they were famous entertainers at their banquets and drinking parties, and thus they too got a network connection with the elite. Once again, network closeness trumps mere abstract status.
One gets the impression that courtesans, although obviously gold-diggers, were not as cynical as the upper-class women in arranged marriages. We do not hear of courtesans murdering anyone, although they would have had plenty of opportunities. Their lack of family connections made them too vulnerable to risk it.
-- Geopolitics takes the form of multi-sided unstable conflicts. There are more than two great powers; there are three, four, five of them. And there are a lot of smaller players who can maneuver on the margins or in the interstices of the major conflicts, building little local empires without much notice, then intruding into the major conflicts, just as Macedon blindsided the bigger Greek players Athens, Sparta, Thebes, the Boeotian League, and their Asian opponent Persia. Weakening one of the major powers did not mean reducing the number of players, since others’ gains were only temporary. This was not the balance-of-power strategy employed by the British in the 19th and 20th centuries, where they would intervene on the Continent on the side of whichever coalition was weaker; that was a strong third party intervening into a two-sided conflict, whereas the Greek situation was more highly multi-sided. Geopolitical theory of conflict needs to recognize that conflicts among 4 or more are inherently more unstable than conflicts among 3 or less.
-- Combine this multi-sided geopolitical instability with external support for internal rivalries, and the ingredients are present for murderous family conflict. Exiles sheltered by a foreign power; hostages who become acclimated to a foreign point-of-view; these create the danger of “pretenders” to the throne awaiting the opportunity to return. Notice the mixture of altruism and calculated strategy: sympathy for exiles in hard times was also a device for expanding one’s power. (Similar in this respect is the modern practice of humanitarian interventions.) The result is a network of states who are used to receiving and sending well-known persons among each other, and have an interest in each other’s internal affairs. Interfering in the internal affairs of another state became an habitual practice. Rich states, who had a lot of gold, would send funds to the faction they wanted to support in another state, whether a rival state, an ally or one that could swing either way. These could be called bribes (usually by the opposing faction), gifts, subsidies, or even tribute (if the recipient construed the money as a sign of the giver’s inferiority). Today's equivalent would be foreign aid (in the altruistic language of American foreign policy), or subsidies (like those sent by Saudi Arabia and Qatar to rebel factions in Syria, thereby prolonging its interminably multi-sided civil war.)
To sum up: combine hereditary monarchy, arranged political marriages, unstable multi-sided geopolitics, networks of exiles and pretenders, and foreign intrusion in domestic affairs: the result is violence in the heart of the family, uninhibited by love or loyalty."