 Karan Singh who ruled from 1631 to 1639 , under the suzerainty of the Mughals , built the Karan Mahal palace . Later rulers added more floors and decorations to this Mahal . Anup Singh , who ruled from 1669 – 98 , made substantial additions to the fort complex , with new palaces and the Zenana quarter ( royal dwelling for females ) . He refurbished the Karan Mahal with a Diwan @-@ i @-@ Am ( public audience hall ) and called it the Anup Mahal . Gaj Singh who ruled from 1746 to 1787 refurbished the Chandra Mahal ( the Moon palace ) . Following him , Surat Singh ruled from 1787 to 1828 and he lavishly decorated the audience hall ( see picture in info box ) with glass and lively paintwork . Dungar Singh who reigned from 1872 to 1887 built the Badal Mahal ( the weather palace ) named so in view of a painting of falling rain and clouds ( a rare event in arid Bikaner ) . Ganga Singh who ruled from 1887 to 1943 built the Ganga Niwas Palace , which has towers at the entrance patio . This palace was designed by Sir Samuel Swinton Jacob . Ganga Singh ’ s son Sadul Singh succeeded his father in 1943 but acceded to the Union of India in 1949 . He died in 1950 . 
