In around 1020 BC the Israelite tribes reunited to form the united kingdom of Israel and Judah when the prophet Samuel anointed Saul from the tribe of Benjamin as the first king.
Due to his disobedience to God, Saul’s reign was curtailed and his kingdom given to another dynasty. David from the tribe of Judah was chosen by God and anointed by the prophet Samuel as king.
Saul’s reign was characterized by constant conflict with Philistines, and then by civil war against forces loyal to David.
Saul’s heir, Ishbaal (aka Ishbosheth), took over rulership of Israel after the death of his father and three brothers but ruled for only two years before he was assassinated.
David, who had become king of the tribe of Judah only, was appointed king of Israel in Ishbaal’s place after his death reigning from c. 1000-961 BC.
Solomon, David’s son and successor, maintained the unified monarchy, c. 961-922 BC.
On the succession of Solomon’s son, Rehoboam, in c. 930 BC, the country split into two kingdoms: the kingdom of Israel (containing the ten Northern tribes and including the cities of Shechem and Samaria) in the North and the kingdom of Judah (containing Jerusalem) in the South.
The History of the Kings of Israel and Judah was characterized by their constant disobedience to God; only a handful of kings were faithful and whenever a disobedient king rose to power, he led the whole nation away from God and turned the people to idolatry.
The kingdom of Israel (or Northern kingdom, aka Samaria and Ephraim) existed as an independent state until c. 731 BC when it was conquered by the Assyrian Empire, while the kingdom of Judah (or Southern kingdom) existed as an independent state until c. 586 BC when it was conquered by the Babylonian Empire.