About A.D. 1527, the King of Pegu, enraged by the exploits of Siamese marauders in his frontier province of Tavoy, collected an army at Moulmein and sent it into Siam under the leadership of the heir apparent, Bureng Naung. Defeating the Siamese near Supanburi, the Peguan prince advanced to the walls of Ayuthia itself; so stout was the resistance, however, and so prolonged the siege that his supply system broke down and he was forced to return to his own country, fighting rear-guard actions and losing heavily all the way. After 3 years, Bureng Naung, now King, taking the assumption by the King of Siam of the title "Lord of the White Elephants" as a casus belli, again attacked Siam with a great army and once more besieged the capital. This time, to save the city, the "Lord of the White Elephants" was compelled to negotiate and to turn over several of the animals in question to the invader, who then retired. Only a few years later, however, the Siamese King repudiated Peguan suzerainty; Bureng Naung returned, by treachery gained admission to the city, sacked and partially destroyed it, and sent the King, with many of his followers, in chains to Pegu. Leaving the Siamese governor of Pitsanulok as his viceroy in Ayuthia, Bureng Naung pressed on to subdue other cities but was scarcely out of sight when a Cambodian army, burning to avenge recent defeats and to reestablish ancient rights, appeared to begin a new siege of Ayuthia; this enemy was repulsed but not before the unprotected districts around the capital had been thoroughly looted. Just now, when, attacked from east and west, her provinces despoiled and her people fugitive or captive, Ayuthia seemed doomed to early extinction, a hero arose to redeem her. This was Phra Naret, a son of Bureng Naung's viceroy, who, appointed by his father governor of Pitsanulok, in his youth saw military service defending his province against robber bands and in the wars of Nanda Bureng, son and successor to Bureng Naung, against the rebellious province of Ava. By his ability bringing upon himself the dislike of the Peguan King, to such a degree that his life was endangered, he revolted (ca. A.D. 1565) and led a Siamese army to sack and pillage Tenasserim and Martaban. Two punitive expeditions sent against him were signally defeated by Naret, who was then crowned King of Siam and at once began to restore Ayuthia and to repopulate it by captives brought from outlying districts which had attempted to cast off their allegiance.