Dynasties are lines of kings originating with Lord Brahmā and extending continuously through past, present and future. The accounts of such dynasties, especially of their most prominent members, constitute the subject of dynastic history.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
राज्ञां ब्रह्मप्रसूतानां वंशस्त्रैकालिकोऽन्वयः । वंशानुचरितं तेषां वृत्तं वंशधराश्च ये
rājñāṃ brahmaprasūtānāṃ vaṃśastraikāliko'nvayaḥ | vaṃśānucaritaṃ teṣāṃ vṛttaṃ vaṃśadharāśca ye
SB 12.7.16