Isa Khan's tomb was 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 octagonal garden, it bears a 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 deep veranda, around it supported by pillars. It stand south of the Bu Halima garden just as visitors enter the complex. An inscription on a red sandstone slab indicated that the tomb is of Masnad Ali Isa Khan, son of Niyaz Aghwan, the Chief chamberlain, and was built during the reign of Islam Shah Suri, son of Sher Shah, in 1547-48 A.D. On 5 August 2011 the restoration work on this tomb in New Delhi led to the discovery of the India's oldest sunken garden. Isa Khan’s garden tomb in the enclosed area of Humayun’s Tomb World Heritage Site in the Capital of India can now be considered the earliest example of a sunken garden in India – attached to a tomb – a concept later developed at Akbar’s Tomb and at the Taj Mahal.