2 Kings 22:1

Josiah was eight years old when he began to reign
And must be born when his father was but sixteen, for Amon lived but twenty four years, ( 2 Kings 21:19 ) ,

and he reigned thirty and one years in Jerusalem;
and so must die at thirty nine years of age:

and his mother's name was Jedidah, the daughter of Adaiah of Boscath;
a city of the tribe of Judah, (See Gill on Joshua 15:39).