Srimad-Bhagavatam: Canto 12 - Chapter 1 - Verse 18

Sanskrit:

शुङ्गं हत्वा देवभूतिं काण्वोऽमात्यस्तु कामिनम् ।स्वयं करिष्यते राज्यं वसुदेवो महामति: ॥ १८ ॥

ITRANS:

śuṅgaṁ hatvā devabhūtiṁkāṇvo ’mātyas tu kāminamsvayaṁ kariṣyate rājyaṁvasudevo mahā-matiḥ

Translation:

Vasudeva, an intelligent minister coming from the Kāṇva family, will kill the last of the Śuṅga kings, a lusty debauchee named Devabhūti, and assume rulership himself.

Purport:

Apparently, because King Devabhūti was lusty after the wives of other men, his minister killed him, assuming leadership and thus beginning the Kāṇva dynasty.