Kimura analyses various items of external evidence relating to the date and process of translation for the Shi’ermen lun 十二門論 T1568: T2059, T2149 and T2034 do not give any information concerning the date of translation. T1568 is not recorded in the Er Qin lu 二秦錄 [as reported in LDSBJ], even though Sengrui 僧叡 was the author of a preface to the text, on the one hand, and the reputed compiler of the catalogue, on the other hand. The record 弘始十年(408 CE)於大寺出 in T2154 and 以大秦弘始年於逍遙園中 in the Shi’ermen lun zong zhiyi ji 十二門論中致義記 T1826 contradict each other [especially regarding the place of translation], and both seem to be baseless. There is a possibility that the preface is apocryphal and, according to Xuji gujin Fodao lunheng 續集古今佛道論衡 T2105 and Kamata Shigeo 謙田茂雄, that T1568 was translated when Kumārajīva was in Liangzhou 涼州. [On the other hand, if the preface is genuine, this conflict may have implications for the authenticity of the Er Qin lu --- MR.]