When the wicked Queen of Judah, Athaliah, ordered a massacre of the royal family, Jehosheba rescued her nephew Joash from certain death (2 Kings 11:1-3 and 2 Chron. 22:10-12). Joash was an infant, and was hid for six years before he was crowned king by Jehoiada the priest. Jehosheba was a half sister of King Ahaziah, who was killed in battle. Ahaziah's mother Athaliah, wanted the throne herself, and attempted to kill all her grandsons. But Jehosheba rescued Ahaziah's youngest son, Joash. The courageous act of Jehosheba, preserved the linage of David, from which Jesus was descended.
The name Jehosheba (or Jehoshabeath) means "the Lord is her oath."
Next person in the Bible: Jehu, King of Israel