SB 9.20.7
tasya medhatithis tasmat
praskannadya dvijatayah
putro ’bhut sumate rebhir
dusmantas tat-suto matah
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
The son of Kanva was Medhatithi, whose sons, all brahmanas, were headed by Praskanna. The son of Rantinava named Sumati had a son named Rebhi. Maharaja Dusmanta is well known as the son of Rebhi.