What is the modern name for Ninevah?
Niniveh is Mosul in northern Iraq.
The book of Nahum is in the Old Testament (OT). The author of the book is Nahum himself. Nahum prophecies the destruction of Ninevah which was the capital of the Assyrians who were a ruthless and bloodthirsty people. God had spoken against Ninevah and its evil and it was destroyed in 612BC by the Babylonians and Medes.
Even in the Hebrew Bible (Old Testament), Ninevah was considered a major destination-- in the Book of Job, the relunctant prophet is told to go there, and it is called a "great city," but one that is also known for wickedness. Historically, we know that Ninevah (which would be in Iraq today, close to the city of Mosul) was one of the oldest cities in the ancient world-- some sources say it was settled as…