10 Aug 2007 (Jakarta Post) – An interesting article about the sultante of Mataram which existed during the 16th and 18th centuries, not to be confused with the kingdom of Mataram that existed in the 6th and 10th centuries.
Tracking down traces of Mataram kingdom
The 17th century Islamic kingdom of Mataram, under the leadership of Sultan Agung, used to be a major state known throughout the world. An inland kingdom located, Mataram still boasted a strong naval fleet.
Dutch national Jan Vos, who in 1924 visited Kerto Islamic Mataram — which still exists in Kerto, Pleret — wrote in his diary that Islamic Mataram, ruled by sultanic leadership, was a great and imposing kingdom.