en_tn/1ki/15/09.md

In the twentieth year of Jeroboam king of Israel

This refers to the twentieth year of Jeroboam's reign. AT: "After Jeroboam had been the king of Israel for almost twenty years" (See: rc://en/ta/man/translate/figs-explicit)

In the twentieth year

"In year 20" (See: rc://en/ta/man/translate/translate-numbers)