 The north coast of Java, particularly Surabaya and Tuban, for the first time became important centres of trade.Although there are few surviving archaeological remains dating from his time, Airlangga is known to have been a keen patron of the arts, notably literature.In 1035, the court poet Mpu Kanwa composed the "Kakawin Arjunawiwaha", which was adapted from the Mahabharata epic.