Uttara is a tyrannical king. Before the killing of Jarāsandha (Jarasandha), Kṛṣṇa warned him citing examples of four other tyrannical kings. Among these four, after Damvodbhava and Kārtavīryārjuna (Kartaviryarjuna), the third name is given as Uttara. In some versions, the name is Marutta. But he is not known as an evil king anywhere else. So, the reading ‘Uttara’ seems to be valid.