The aim of our study is to concentrate on the brilliancy poems masterpieces in Mosul in the twelfth century to make a suitable definition of the brilliancy of those were living in Mosul in the the twelfth century A.H. The number of its verses and the number of the kinds of its grammar. Then we made a balance between those masterpieces grammatical patterns and the former ones and we talked about their main subjects such as the prophetic praising especially because they were living during a century which was desperately in need of religion, and they were suffering from bad living conditions.