His silver-copper seal was discovered in Bhitari (Ghazipur district, Uttar Pradesh) in 1889, which mentions the names of his father Narasimhagupta and grandfather Purugupta.

[1][2] The seal of Kumaragupta III allowed for the clarification of the genealogy of later Gupta kings: it gave the names of three Gupta king who had been hitherto unknown: Purugupta, Narasimhagupta and Kumaragupta II.

[3] A clay sealing of him was discovered from Nalanda, which also mentioned about his father and grandfather.

He had to face Yashodharman, the Aulikara ruler of Malwa who had defeated the Huna king Mihirakula at Sondani and was conquering Northern India.

Jain is of the view that Kumaragupta III was killed during this conflict, around 530 AD and Kumaragupta III's father Narasimhagupta committed suicide on hearing the news.