Sree Chithira Thirunal also built a beautiful palace named "Kowdiar Palace", finished in 1934, which was previously an old "Naluektu", given by Sree Moolam Thirunal to his mother Sethu Parvathi Bayi in 1915. However, his Prime Minister, Sir C. P. Ramaswami Iyer, was unpopular among the communists of Travancore. The tension between the Communists and Sir C.P. Ramaswami Iyer led to minor riots in various places of the country. In one such riot in Punnapra-Vayalar in 1946, the Communist rioters established their own government in the area. This was put down by the Travancore Army and Navy. The Prime Minister issued a statement in June 1947 that Travancore would remain as an independent country instead of joining the Indian Union; subsequently, an attempt was made on the life of Sir C.P. Ramaswamy Iyer, following which he resigned and left for Madras, to be succeeded by Sri P.G.N. Unnithan. According to witnesses such as K.Aiyappan Pillai, constitutional adviser to the Maharaja and historians like A. Sreedhara Menon, the rioters and mob-attacks had no bearing on the decision of the Maharaja. After several rounds of discussions and negotiations between Sree Chithira Thirunal and V.P. Menon, the King agreed that the Kingdom should accede to the Indian Union in 1949. On 1 July 1949 the Kingdom of Travancore was merged with the Kingdom of Cochin and the short-lived state of Travancore-Kochi was formed. On 11 July 1991, Sree Chithira Thirunal suffered a stroke and was admitted to Sree Chithira Thirunal hospital, where he died on 20 July. He had ruled Travancore for 67 years and at his death was one of the few surviving rulers of a first-class princely state in the old British Raj. He was also the last surviving Knight Grand Commander of both the Order of the Star of India and of the Order of the Indian Empire. He was succeeded as "head" of the Royal House as well as the "Titular Maharajah" of Travancore by his brother, Uthradom Thirunal Marthanda Varma. The Government of India issued a stamp on Nov 6, 1991, commemorating the reforms that marked the reign of Maharajah Sree Chithira Thirunal in Travancore.