Mahmudabad Estate or Mahmoodabad Estate, governed from Mahmudabad, was one of the largest feudal estates in the erstwhile Kingdom of Oudh. The rulers were generally referred to as Raja of Mahmudabad or Raja of Mahmoodabad.
The Mahmudabad Estate was founded in 1677 by Raja Mahmud Khan. The last ruler might also have an interaction with famous writer Saadat Hassan Manto, as mentioned in famous book Dozakhnama-chapter 38 (writer Rabisankar Bal)
Bilehra Palace was built in Indo-European Regency-style architecture as royal residence in Mahmudabad Estate. It was constructed between 1835 and 1865. However, after the death of the last Raja, Abul Hasan Khan, in 1918, during the Spanish flu pandemic, it fell into disrepair.