Less than 1km north of Itmad-ud-daulah is Chini-ka-rauza , built in 1635 and reputed to be the mausoleum of Afzal Khan, a Persian poet and Shah Jahan's prime minister. Neglected and decaying, its soft brown stone is victim to the elements and is now crumbling away into the riverbank. Topped with an Afghan-style bulbous dome, the dull earth-coloured tomb is a far cry from Nur Jahan's delicate work, but is distinctive as Agra's sole Persian construction. Parts of the walls are still covered with the coloured enamel tiles ( chini ) that once enhanced the whole of the exterior and gave the tomb its name, while traces of paintings and Islamic calligraphy can still be made out on the high domed ceiling.