During his second western campaign from 734 to 732 BC, Tiglath-pileser attacked Israel again. Pekah had joined forces with King Rezin of Aram in a poorly planned anti-Assyrian alliance (see Isaiah 9:1). As a result, Tiglath-pileser captured much of Israel’s northern and eastern lands.
Pekah’s failed political strategies caused unrest in Israel, leading to his assassination by Hoshea. Hoshea likely acted to appease the Assyrian king and save the northern kingdom. In his records, Tiglath-pileser claimed he placed Hoshea on the throne and received a large tribute from him.
The twentieth year of Jotham, starting from his co-regency with his father Uzziah in Judah, was 732 BC, the year he died.