About Nalgonda
Nalgonda is a city and municipality in the Indian state of Telangana. It is the headquarters of the Nalgonda district, as well as the headquarters of the Nalgonda mandal in the Nalgonda revenue division.
The city's name is derived from two Telugu words: nalla ("black") and konda ("hill"). In the past, Nalgonda was referred to as Nilagiri. During the medieval Bahamani kingdom, it was renamed Nallagonda. The name was changed to "Nalgonda" for official uses during the rule of the later Nizam kings.
Source : Wikipedia