en_tn/1ki/15/01.md

In the eighteenth year of King Jeroboam son of Nebat

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

In the eighteenth year

"In year 18" (See: rc://en/ta/man/translate/translate-numbers)