Airrlangga had bestowed titles upon his loyal followers when the capital of Kahuripan was moved from Watan Mas to Kahuripan in 1037.

According to the Kelagen inscription (dated 1037) Airlangga also took a keen interest on agriculture development, embarking on grand irrigation project by constructing the Wringin Sapta dam, located in today Jombang regency.

By building a dam on Brantas river, he provides irrigation to surrounding paddy fields and maintaining hydraulic system in the area.

Airlangga divides Kahuripan in 1045 into two kingdoms which are inherited by his two sons; Janggala and Kediri.

Airlangga himself abdicates the throne in 1045, returning to the hermit life by assuming a new name as Resi Gentayu, bestowed by Mpu Bharada, a famous hermit.

The reasons behind the partition of a kingdom that Airlangga had so painstakingly united during his younger years remains a puzzle for historians.