Isa Khan Niazi was an Afghan noble in the court of Sher Shah Suri and his son Islam Shah Suri, of the Sur dynasty, who fought the Mughal Empire.
Isa Khan's tomb built during his lifetime ca 1547-48 AD, is situated near the Mughal Emperor Humayun's Tomb complex in Delhi which was built later between 1562-1571 AD. Built within an enclosed garden, it is bears striking resemblance to other tombs of Sur dynasty monuments in the Lodhi Gardens. This octagonal tomb has distinct ornamentation in the form of canopies, glazed tiles and lattice screens and a corridor around it supported by pillars.
Also across this tomb lies a mosque, built along with the tomb, known as Isa Khan's mosque with noticeable mehrabs. Many of the architectural details present in these structures can be seen further evolved in the main Humayun's tomb, though on a much grander scale
Isa Khan's tomb is located immediately to the south of Bu Halima Enclosure. It consists of an octagonal garden enclosure, with the entrance on the north. Right in the centre lies the mausoleum. With a central octagonal chamber surrounded by verandahs, each side pierced by three arches, the mausoleum rises from a low plinth and is surrounded by a dwarf wall.
Above the arches runs a chhajja and each of the side is surmounted on the roof by a domed chhatri, with the central dome rising from a thirty-two-sided drum. The sides of the chamber are closed by perforated stone slabs except on the west and south. The western side contains a minhrab on the interior, while the southern side forms the main entrance. A three-domed mosque projects outward from the western side of the octagonal enclosure. It follows, thus, the typical pattern of the octagonal Lodi tombs.
en.wikipedia.org/wiki/Isa_Khan_Niazi 