About Huna ben Nathan, 24th Exilarch Mar Huna IV
Abba was succeeded first by his son Nathan and then by another son, Mar Kahana. The latter's son Huna is then mentioned as successor, being the fourth exilarch of that name; he died in 441, according to a trustworthy source, the "Seder Tannaim wa-Amoraim." Hence he was a contemporary of Ashi, the great master of Sura, who died in 427. In the Talmud, however, Huna b. Nathan is mentioned as Ashi's contemporary, and according to Sherira it was he who was Mar Kahana's successor, a statement which is also confirmed by the Talmud (Zeb. 19a). The statement of Seder 'Olam Zuṭa ought perhaps to be emended, since Huna was probably not the son of Mar Kahana, but the son of the latter's elder brother Nathan.