According to the Chinese Song Dynasty book Zhu Fan Zhi, written around 1225 by Zhao Rugua, the two most powerful and richest kingdoms in the Southeast Asian archipelago were Srivijaya and Java (Kediri), with the western part (Sumatra, the Malay peninsula, and western Java/Sunda) under Srivijaya's rule and the eastern part was under Kediri's domination. It says that the people in Java followed two kinds of religions, namely Buddhism and the religion of Brahmins (Hinduism), while the people of Srivijaya followed Buddhism. The book describes the people of Java as being brave, short-tempered and willing to fight. It also notes that their favourite pastimes were cockfighting and pig fighting. The coin used as the currency then were made from a mixture of copper, silver, and tin.