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How long did Jotham reign?
“In the second year of Pekah ... began Jotham the son of Uzziah king of Judah to reign. Five and twenty years old was he when he began to reign, and he reigned sixteen years in Jerusalem” (2 Kings xv, 32, 33).
“And Hoshea ... slew him [Pekah] and reigned in his stead, in the twentieth year of Jotham the son of Uzziab” (2 Kings xv, 30).