The answer is: Darius

Daniel 6:16

King Darius, the ruler who found himself entangled in one of the most dramatic incidents in the Bible, ruled over the Medes and Persians during a time characterized by deep intrigue and division among advisors. The story of Daniel being thrown into the lion's den is not just an account of divine rescue; it also highlights King Darius’s struggle between adhering to the law and his personal affection for Daniel.

In a fascinating twist, Darius was deceived into enforcing a decree that put Daniel’s life on the line. Imagine, Darius was not just an autocratic ruler; he showed a degree of governance that valued justice and loyalty yet succumbed to the manipulations of his bureaucratic advisors.

After a troubled sleep that night, the once-decisive king rushed to the lion’s den at dawn, calling Daniel’s name. What a powerful moment: the king’s relief when he discovered Daniel unharmed. This heady episode speaks volumes about the themes of faith, integrity, and unwavering trust where, despite the imminent peril, Daniel remained committed to his religious beliefs—a testament borne throughout scripture.

Intriguingly, the name "Darius" itself appears approximately five times in the Bible, but scholars sometimes debate the exact identification of this king. Some even suggest parallels with historical figures like Darius the Great, weaving the historical and biblical accounts intricately together. As these stories unfold, they remind us of humanity's continuous quest for justice amidst shocking temptations and turmoil.