2 Chronicles 36:11

"Zedekiah was one and twenty years old when he began to reign, and reigned eleven years in Jerusalem."

Cross References (ranked by relevance)

And it came to pass the same year, in the beginning of the reign of Zedekiah king of Judah, in the fourth year, and in the fifth month, that Hananiah the son of Azur the prophet, which was of Gibeon, spake unto me in the house of the LORD, in the presence of the priests and of all the people, saying,

Jeremiah 27:1

In the beginning of the reign of Jehoiakim the son of Josiah king of Judah came this word unto Jeremiah from the LORD, saying,