The famous book Kitab Al Tajmi was written by?

The famous book you're referring to is likely Kitab al-Taj (Arabic: كتاب التاج), also known as The Crown of the Book of the Kings, which translates to The Book of the Crown.

However, there is no author named "Tajmi" associated with this book. The author of Kitab al-Taj is Ibn Khaldun**, a renowned Arab historian and sociologist.

It's possible you've misremembered the name of the author or the title of the book. If you have any other details about the book, I might be able to help you pinpoint the correct information.