since then; from that time; ever since
since the dawn of history
since that time; since then; from that point (on)
since our last meeting; since we parted
for as long as one can remember
since the beginning of the world; since the dawn of history
since that time; since then; from that point (on)
from (since) ancient times; from time immemorial
since the era of the Emperor Jinmu; (first ever) since the dawn of Japan's history; unprecedented