Hauz Khas was established by Alauddin Khilji in the year 1284. The word comes from urdu word Hauz which means Pond. The emperor commissioned a very large pond or tank in this area for the use of the inhabitants of Siri Fort, the second city of Delhi. Earlier it was named as Hauz-i-Alai after the name of emperor Alauddin Khilji. Firuz Shah Tughlaq later ordered to clean the tank which was full of silt. He also built royal baths on the southern side of the tank. It was he who christined it to Hauz-Khas.
The most important building inside the ruins is the tomb of Firuz Shah
Tughlaq. The tomb worn out because of being ignored. It was later
repaired during on the orders of Sikandar Lodhi. The buildings which you
see at the flank was build by Lodhi in about 1354. It included various
halls and chambers which was later converted in to a madrasa or college
for theological training. The other bizzare construction are the
staircases which join the pond from each floor of the madarsa. You will
also find many cenotaphs which are supposed to be built over the
possible graves of teachers.
Taimur, who invaded Delhi in 1399, was highly impressed by the tank and
buildings around it. He ordered his royal architect to replicate the
same design in his hometown Samarkand.