<Li> Gurjara - Pratihara Dynasty </Li> <Li> Chola Dynasty, c. 848--c. 1251 CE </Li> <Li> 2nd Chalukya Dynasty, c. 973--c. 1187 CE </Li> <Tr> <Td> Late medieval (show) <Ul> <Li> Delhi Sultanate, c. 1206--c. 1526 CE <Ul> <Li> Slave Dynasty </Li> <Li> Khalji Dynasty </Li> <Li> Tugluq Dynasty </Li> <Li> Sayyid Dynasty </Li> <Li> Lodhi Dynasty </Li> </Ul> </Li> <Li> Pandyan Dynasty, c. 1251--c. 1323 CE </Li> <Li> Vijayanagara, c. 1336--c. 1646 CE </Li> <Li> Bengal Sultanate, c. 1342--c. 1576 CE </Li> </Ul> </Td> </Tr>

Which ruling dynasties engaged in a tripartite struggle to control kannauj give reasons