after the name of Ali Bux. Siwan has historical and mythological importance attached to it Siwan became a fully-fledged district when it was split from Saran in 1976. Sub Divisions : Siwan, Maharajganj Blocks : Mairwa, Pachrukhi, Raghunathpur, Andar, Guthani, Maharajganj, Darauli, Siswan, Daraunda, Husainaganj, Bhagwanpur, Hat, Goriyakothi, Baraharia, Habibpur, Siwan