<Li> Daulatabad (1327--1334) </Li> <Li> Delhi (1334--1506) </Li> <Li> Agra (1506--1526) </Li> <Tr> <Th> Common languages </Th> <Td> Persian (official), Hindavi (1451--1526) </Td> </Tr>

Write a paragraph describing the important monuments built by the delhi sultans