Which Persian King allowed the Jews to go back to rebuild the temple?

The Persian King who allowed the Jews to go back to rebuild the temple was Cyrus. After the Babylonian Empire conquered Judah and destroyed the Temple in Jerusalem in 586 BCE, the Jewish people were taken into exile. However, in 539 BCE, the Persian Empire, led by King Cyrus, conquered Babylon and allowed the Jewish people to return to their homeland. Cyrus issued a decree that allowed the Jews to return to Jerusalem and rebuild their temple. This decree is recorded in the Hebrew Bible in the book of Ezra. Cyrus is regarded as a liberator and a hero by the Jewish people, who consider him to be an instrument of God's will.