Abimelech makes himself king
After Gideon died, his son Abimelech murdered seventy brothers and ruled Shechem for three years until a woman dropped a millstone on his head.
Thus God repaid the wickedness of Abimelech, which he did to his father in killing his seventy brothers
Judges 9:56 (World English Bible)
Only the youngest brother, Jotham, escaped. From Mount Gerizim he told a fable about trees choosing a thornbush as king and warned that fire would consume both Abimelech and Shechem. It did: the two turned on each other, Shechem was destroyed, and Abimelech died besieging Thebez.
Places
ShechemMount GerizimOphrahBeth-milloTower of ShechemArumahThebezBeerDiviners’ OakMount ZalmonTabbur-erez
Dating notes
Abimelech ruled three years (Judges 9:22). Ussher: Gideon dies and the killings happen 1236 BC; Abimelech made king 1235 BC; he dies 1233 BC.