to come to mind; to occur to

a memory, recollection, reminiscence / a keepsake, memento

float / (of an idea) to present itself, come to mind

ancient times, a very long time ago

to hear, to listen / to obey / to ask a question / to smell, sniff

once (in the indeterminate past)

the past, old times / ancient

olden days; former

(music) a song / (poetry) poetry

(と〜) thinking that […] (with the next clause explaining that the truth is contrary to expectations)