The phrase "a thing of memory" is correct and usable in written English.
It can be used to refer to something that is remembered or recalled, often evoking nostalgia or reflection on the past.
Example: "The old photograph was a thing of memory, reminding her of the joyful days spent with her family."
Alternatives: "a memory" or "a remnant of the past".
With so much new-found pride in their city, it was easy to imagine that Valencians would never again commit the architectural crimes of the past, that the knee-jerk cementing of the coastline and construction of characterless apartment blocks was a thing of painful memory.
The serene canter to the title that was Sebastian Vettel's 2011 season is a thing of distant memory.
The medium itself is poised to become a thing of the past, a memory.
My dastardly deeds are a thing of the past, a distant memory, but their echo remains in the form of guilt.
It brought me back to my youth watching gigs at the Leicester Charlotte, but now, at 25, such memories are a thing of the past and I find myself frightened by the teenage rave scene.
There is a string of memories attached to that thing.
The Civil War is that paradoxical thing in history, a kind of memory screen.
Though his performance was, among many things, a prodigious feat of memory, that is not the way to think of it.
But the spirit and the commitment of the tribunal, no matter the ambivalences and reservations it too may contain, suggests that memory is a strange and often wondrous thing: there is, blessedly, such a thing as the duty of memory – and it often imposes a continuity, particularly when the time calls for it, upon the act of remembering.
This is revealed not merely in his striking deployment of decidedly Humean terminology when, for instance, he contrasts the perception and the memory of a thing in terms of "vividness" (Bain 1903: 42).
