According to the World History Encyclopedia, King David died of natural causes at an advanced age, and his son, Solomon, assumed his throne. Though David had (probably) eight wives and (probably) 10 concubines, King Solomon seemed to take things up a notch in a Biblical case of "hold my beer." According to 1 Kings 11, Solomon was recorded to have at least 700 wives (though the text itself only mentions those wives "of royal birth"), and at least 300 concubines.
Though polygamy of this kind was described in the Jewish bible in neutral terms, it seems that the line was drawn at marrying the wrong wife, and men who did so paid for it dearly. Solomon's mother, Bathsheba, was an example. According to the narrative, with Bathsheba having been already married when David had sex with (or sexually assaulted) her, David and Bathsheba both paid for this by losing their first son. In-kind, Solomon's marriage to a woman also deemed "wrong" within the text cost him dearly.
Per MyJewishLearning, Solomon's mistake — one which his father managed to avoid — was marrying a woman who worshipped deities other than that of the ancient Israelites; and, taking things a step further, setting up temples so they could worship. God punished Solomon, following the king's death, by stripping away the power of his family's line. This sets the stage for a revolt that would, in the end, see his kingdom split into two.
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