during Sultan Agung's attempts to capture Batavia from the Dutch, the Jawanese forces were centered in Cirebon/Tegal/Banten. Thus kerises during that period are actually easier to identify, being bigger and longer than normal keris as they were meant for war. This hefty size of kerises were later on called the corok classification. The Makassarese/Buginese, fresh from their defeat in Gowa makassar later on adopted the corok keris as one of their weapons, hence the keris sundang which later on spread to the whole archipelago especially in bugis dominated area in sumatra and kalimantan including southern filipina.
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