Sheba son of Bichri: a Benjaminite who led Israel's tribes in a short-lived revolt against King David right after Absalom's rebellion collapsed
Sheba appears only in 2 Samuel 20, right after Absalom's revolt has collapsed and David is on his way back to Jerusalem. A bitter argument breaks out between Judah and the rest of Israel over who has the greater claim on the king, and Sheba, introduced as "a worthless man," seizes the moment. He blows the ram's horn and shouts the cry that becomes the whole rebellion's slogan: "We have no portion in David, no inheritance in the son of Jesse; every man to his tents, O Israel!" The whole of Israel deserts David and follows him; only Judah stays loyal.
David treats this new threat as more dangerous than Absalom's own revolt and moves fast to put it down. When Amasa is too slow gathering Judah's troops, David sends Abishai after Sheba, but it is Joab who actually takes charge, killing Amasa on the road and leading the pursuit himself. Joab chases Sheba the length of the country and finally traps him inside the northern town of Abel Beth-maacah, where he begins building a siege ramp against the wall.
The siege ends not through a battle but through a conversation. A wise woman inside the town negotiates with Joab, then persuades the townspeople to cut off Sheba's head and throw it over the wall to him. Joab calls off the siege and the town is spared. Nothing further is told about Sheba; the story remembers him only for the revolt he started and how quickly it was ended.
His name is spelled exactly like the everyday Hebrew word for the number שֶׁבַע, "seven." Hebrew names were often built directly on ordinary words like this one, so the coincidence needs no special explanation on its own; the text never draws attention to it here, unlike the wordplay it makes around this very same word at Beersheba.