atharva-the Atharva-veda; aṅgirasam-unto the rsi Aṅgira; asit-was entrusted; sumantuh-also known as Sumantu Muni; darunah-seriously devoted to the Atharva Veda; munih-the sage; itihasa-purananam-of the historical records like the Puranas; pita-father; me-mine; romaharsanah-the rsi Romaharsana.