Jeremiah 52:1

Zedekiah was twenty-one years old when he became king, and he reigned in Jerusalem eleven years. His mother’s name was Hamutal daughter of Jeremiah; she was from Libnah.
BSB · Berean Standard Bible
Zedekiah was one and twenty years old when he began to reign, and he reigned eleven years in Jerusalem. And his mother’s name was Hamutal the daughter of Jeremiah of Libnah.

Note began…: Heb. reigned

KJV · King James Version
Zedekiah was twenty-one years old when he began to reign. He reigned eleven years in Jerusalem. His mother’s name was Hamutal the daughter of Jeremiah of Libnah.
WEB · World English Bible
Zedekiah was one and twenty years old when he began to reign; and he reigned eleven years in Jerusalem: and his mother’s name was Hamutal the daughter of Jeremiah of Libnah.
ASV · American Standard Version

Related passages

From the Treasury of Scripture Knowledge, grouped by the word they explain.

one
A.M. 3406-3416. B.C. 598-588.
2 Kings 24:18; 2 Chronicles 36:11
begin to reign
Heb. reigned. Libnah.
Joshua 10:29; Joshua 15:42