The contributary factors in the decline of Srivijaya were foreign piracy and raids that disrupted trade and security in the region. Attracted to the wealth of Srivijaya, Rajendra Chola, the Chola king from Tamil Nadu in South India, launched naval raids on ports of Srivijaya in 1025. His navy sailed swiftly to Sumatra using monsoon winds, made a stealth attack and raided Srivijaya's 14 ports. The strike took Srivijaya by surprise and unprepared; they first ransacked the capital city of Palembang and then swiftly moved on to other ports including Kadaram (modern Kedah).