See Janos Szerb, Glosses on the Oeurve of Bla-ma 'Phags-pa I: On the Activity of Sa-skya Paṇḍita, contained in: M. Aris and Aung San Suu Kyi, eds., Tibetan Studies in Honour of Hugh Richardson,Vikas (New Delhi 1980), pp. 290-300. On p. 292, he says, "However, we know that a somewhat mysterious Tibetan lama called Na mo was appointed to the rank of 'kuo-shih' by Güyük as early as 1247. He was the superintendent of Buddhist affairs in the whole Mongol Empire... and he is mentioned in 1255 too." However, Szerb would appear to be somewhat misleading here. Namo was not 'Tibetan,' but rather a Kashmiri Buddhist, brother of Otochi ('physician'), both of whom were present at Ögedei's court.
It seems he was the proponent of Buddhism in the debates with Daoists held in 1255 and 1256.
