- Jul 20 Java War begins in the Dutch East Indies, a rebellion against Dutch rule led by Javanese Prince Diponegoro - lasts till 1830 and kills over 200,000 Javanese
- Jul 21 Java princess Dipo Negoro/Mangkubumi declare war on all non-islamics
- Jul 30 Malden Island is discovered in the central Pacific by British warship HMS Blonde
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