He ordered Shadrach, Meshach, and Abednego into a furnace for not worshiping his golden idol, but they were protected by a fourth figure.
After losing his mind due to pride, he was restored to his throne after recognizing the Most High God. Useful Resources & Sources
According to Daniel 4, he lived like a beast/cow for "seven times" (often interpreted as 7 years) due to his extreme pride, an account some interpret as a form of the psychological disorder boanthropy. Key Episodes & Figures
Nebuchadnezzar II (ruled 605–562 BC) was the most powerful king of the Neo-Babylonian Empire, credited with transforming Babylon into a city of wonder, including building the Hanging Gardens. He is best known in the Bible for conquering Jerusalem, destroying Solomon's Temple, and initiating the 70-year Babylonian Exile.
He is a key figure in Daniel 1-4, appearing as a narcissistic, sometimes insane ruler who eventually humbles himself.