one hundred years ago; a hundred year previously
Hundred Years War (1337-1453)
the hundredth year; out of luck; (at the) end of one's rope; rare chance; unusually good fortune
permanent national policy
100th birthday anniversary
waiting for one hundred years for the waters of the Yellow River to clear; waiting in vain for an unlikely event; waiting for pigs to fly; when the sky falls, we shall catch larks
a bad wife spells the ruin of her husband; a bad wife means a hundred years of bad luck to her husband
century of humiliation (in Chinese history)