Hujung Galuh located on the estuarine of Brantas river and today is the part of modern Surabaya city.

"[2] Here we learn that Airlangga even before he died handed over his kingdom to retire to his own personal thought and meditation.

This of course seems to be like what we in the world today do with our families in handing over our business to our younger sons in order for us to retire and live in relaxation.

In this division Colin Brown writes in the book, A Short History of Indonesia, "The western portion of Mataram became Kadiri, the eastern part Janggala.

"[2] Putting this all together Kadiri, According to Brown, collapsed in 1222 defeated by the state of Tumapel in the Brantas River valley in the Malang region under the command of previously mentioned Ken Angrok.