“And Hoshea the sonne of Elah, made a conspiracie against Pekah the sonne of Remaliah, and smote him, and slew him, and reigned in his stead, in the twentieth yeere of Iotham the sonne of Uzziah.”
1611 King James Version (KJV)
15:30 Twentieth year - The meaning is, that he began his reign in the twentieth year after the beginning of Jotham's reign; or, which is the same thing, in the fourth year of Ahaz, son of Jotham.