Samguk Yusa
The legend of Heo is found in "Garakgukgi" (the Record of Garak Kingdom) which is currently lost, but referenced within the "Samguk Yusa". According to the legend, Heo was a princess of the "Ayuta Kingdom". The extant records do not identify Ayuta except as a distant country. Written sources and popular culture often associate Ayuta with India but there are no records of the legend in India itself. Kim Byung-Mo, an anthropologist from Hanyang University, identified Ayuta with Ayodhya in India based on phonetic similarity. Grafton K. Mintz and Ha Tae-Hung implied that the Korean reference was actually to the Ayutthaya Kingdom of Thailand. However, according to George Cœdès, the Thai city was not founded until the year 1350, after the composition of "Samguk Yusa".