Relations with regional powers Mataram kingdom had an exceptionally intense relations with the regional hegemon Srivijaya of Sumatra. In earlier period, the relations was close and intimate, as Shailendran kings of Java has formed an alliance with Maharaja of Srivijaya and the two royal houses seems to be merged. In later period however, the relations was deteriorated to warfare, as Dharmawangsa launched failed attempt to capture Palembang, and Srivijaya well-crafted retaliation ensued. In its eastern boundary, the Mataram kingdom seems to subjugate the neighbouring Bali, and pulled the island into its sphere of influence. The Khmer art and architecture during the formative early Angkor era also believed to being influenced by Javanese art and architecture; the striking similarity of the Bakong temple in Cambodia to Borobudur, strongly suggests that Bakong was inspired by Borobudur's design. There must had been exchanges of travellers, if not mission, between Kambuja and Java. Transmitting to Cambodia not only ideas, but also technical and architectural details, including arched gateways in corbelling method. The Kaladi inscription (c. 909 CE), mentioned Kmir (Khmer people of the Khmer Empire) together with Campa (Champa) and Rman (Mon) as foreigners from mainland Southeast Asia that frequently came to Java to trade. The inscription suggests a maritime trade network has been established between kingdoms in mainland Southeast Asia and Java. The name of the Medang was mentioned in the Laguna Copperplate Inscription of the Philippines' Tondo, dated 822 saka (c. 900 CE), discovered in Lumban, Laguna, Philippines. The discovery of the inscriptions, written in the Kawi script in a variety of Old Malay containing numerous loanwords from Sanskrit and a few non-Malay vocabulary elements whose origin is ambiguous between Old Javanese and Old Tagalog, suggests that the people or officials of the Mataram Kingdom had embarked on inter-insular trade and foreign relations in regions as far away as the Philippines, and that connections between ancient kingdoms in Indonesia and the Philippines existed. Legacy Celebrated as the golden age of ancient Indonesian civilisation—more precisely classic Javanese civilisation—the era of Mataram kingdom has left an everlasting mark and legacy in Indonesian culture and history; their monuments. The grand and magnificent Borobudur and Prambanan in particular, has become the source of national pride, not only for local Javanese but also for the whole of Indonesians. It is probably in the same fashion as how Khmer people of Cambodia took pride in their Angkorian legacy.