influence to the east of the River Menam's basin; in turn, the French recognised British influence over the territory to the west of the Menam basin. Both parties disclaimed any idea of annexing Siamese territory. The Anglo-Siamese Treaty of 1909 defined the modern border between Siam and British Malaya. The treaty stated that Siam relinquished their claims over Kelantan, Terengganu, Kedah and Perlis to Great Britain, which were previously part of the semi-independent Malay sultanates of Pattani and Kedah. A series of treaties with France fixed the country's current eastern border with Laos and Cambodia. In 1904, 1907 and 1909, there were new border corrections in favour of France and Great Britain. When King Chulalongkorn died in 1910, Siam had achieved the borders of today's Thailand. In 1910 he was peacefully succeeded by his son Vajiravudh, who reigned as Rama VI. He had been educated at Royal Military Academy Sandhurst and University of Oxford and was an anglicised Edwardian gentleman. Indeed, one of Siam's problems was the widening gap between the Westernised royal family and upper aristocracy and the rest of the country. It took another 20 years for Western education to extend to the rest of the bureaucracy and the army. Nation formation under Vajiravudh and Prajadhipok (1910–1932) The successor of King Chulalongkorn was King Rama VI in October 1910, better known as Vajiravudh. He had studied law and history at the University of Oxford as the Siamese crown prince in Great Britain. After his ascension to the throne, he forgave important officials for his devoted friends, who were not part of the nobility, and even less qualified than their predecessors, an action which had hitherto been unprecedented in Siam. In his reign (1910–1925) many changes were made, which brought Siam closer to modern countries. For example, the Gregorian Calendar was introduced, all the citizens of his country had to accept Family names, women were encouraged to wear skirts and long hair fringements and a citizenship law, Principle of the "Ius sanguinis" was adopted. In 1917 the Chulalongkorn University was founded and school education was introduced for all 7 to 14-year-olds. King Vajiravudh was a favour of literature, theatre, he translated many foreign literatures into Thai. He created the spiritual foundation for a kind of Thai nationalism, a phenomenon unknown in Siam. He was based on the unity of nation, Buddhism, and kingship, and demanded loyalty from his subjects