One verse

Srimad Bhagavatam 9.10.51

9.10.51

त्रेतायां वर्तमानायां काल: कृतसमोऽभवत् । रामे राजनि धर्मज्ञे सर्वभूतसुखावहे ॥ ५१ ॥

tretayam vartamanayam kalah krta-samo ’bhavat rame rajani dharma-jne sarva-bhuta-sukhavahe

tretayam
in the Treta-yuga
vartamanayam
although situated in that period
kalah
the period
krta
with Satya-yuga
samah
equal
abhavat
it so became
rame
because of Lord Ramacandra’s being present
rajani
as the ruling king
dharma-jne
because He was fully religious
sarva-bhuta
of all living entities
sukha-avahe
giving full happiness.

Lord Ramacandra became King during Treta-yuga, but because of His good government, the age was like Satya-yuga. Everyone was religious and completely happy.