One verse

Srimad Bhagavatam 12.7.16

12.7.16

राज्ञां ब्रह्मप्रसूतानां वंश त्रैकालिकोऽन्वय: । वंशानुचरितं तेषां वृत्तं वंशधराश्च ये ॥ १६ ॥

rājñāṁ brahma-prasūtānāṁ vaṁśas trai-kāliko ’nvayaḥ vaṁśānucaritaṁ teṣāṁ vṛttaṁ vaṁśa-dharās ca ye

rājñām
of the kings
brahma-prasūtānām
born originally from Brahmā
vaṁśaḥ
dynasty
trai-kālikaḥ
extending into the three phases of time (past, present and future)
anvayaḥ
the series
vaṁśa-anucaritam
histories of the dynasties
teṣām
of these dynasties
vṛttam
the activities
vaṁśa-dharāḥ
the prominent members of the dynasties
ca
and
ye
which

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.