God you're asking me this now, alright gimme a sec. I don't have a lot of specifics about the item's specified history but here's some item lore:
Demacian artifact; bears the crest of the Lightshield Dynasty.
Shuriman currency. Ancient now so it's likely lost its monetary value, unless you're an artifact seller or archaeologist.
Sword belonging to the king who brought about the ruination of the Shadow Isles (A given I know but some people might not know!)
A demacian armour piece
A Bilgewatian armour piece. Stolen and now worn by Gangplank.
An old, heavily used cannon on Gangplank's ship. Now sunk to the depths of the sea.
True Ice weapon from Freljord.
A weapon of deathly Shadow Isles power.
A relic shield of the Rakkor tribe of Mount Targon.
It's probably Noxian. Just look at it.
True Ice weapon from Freljord. Would've likely belonged to Avarosa when she ruled the Iceborn.
Maybe True Ice, maybe the heart of a Freljordian individual, be they troll, ursine, human, iceborn or Frozen Watcher.
A True Ice weapon from the Freljord.
A Bilgewater trinket.
The horn worn by Greyor, blue side shop keeper of the Howling Abyss.
An Ionian mask.
Crafted in Piltover.
Also crafted in Piltover.
I'd imagine in the new lore this'd be part of a larger garb worn by Ionians to commemorate the victory over Noxian occupation.
An artifact of the Solari.
A tome of power pertaining to magic from the Shadow Isles.
An armour piece from the isle of Buhru; an island found within the Blue Flame archipelago.
An ancient Shuriman weapon.
A Bilgewater trinket.
A fang stolen from of Baron Nashor's maw, so a purchasable part of Voidborn biology. They need to give this thing a new icon.
A tome crafted from knowledge gleaned from the Lost Chapter.
An ancient Shuriman trinket.
A True Ice artifact from Freljord.
Viktor's staff! One of four versions.
A tome crafted from knowledge gleaned from the Lost Chapter.
Demacian artifact; bears the crest of the Lightshield Dynasty.
Created from the feathers of the Razorbeaks on Summoner's Rift.
A Demacian helmet.
A tome crafted from knowledge gleaned from the Lost Chapter. That's the last time I'll say that for this list.
An armguard currently worn by Sejuani. Was formerly owned and worn by Lissandra when she was known as "The Seeker".
An Ionian staff. I was sure it was from the Marai when I first saw it but apparently not.
A Shuriman cape. Bears a striking resemblance to the capes worn by Azir's sand soldiers, indicating that real versions of those soldiers once wore these.
A Bilgewater trinket.
An ancient Shuriman artifact. Given the nature of the Ascension ritual this likely served as a magical focus rather than something to do with Ascension itself.
A truly, truly Noxian weapon. It's gorgeous.
The spear Kalista uses to make pacts. Was also the spear that ended her life.
Noxian armour.
A Noxian weapon.
Something something Void.
An Ionian sword.
An object that likely occurs in southern Shurima. Zz'rot use these to invade Runeterra.
These ones below might be wrong; I'm assuming and speculating on these.
Given Bilgewater's all about sea monsters these could be from Bilgewater. I dunno.
Zephyr means a light wind or a western wind, so I'm assuming this is an Ionian wind blade, like Yasuo's sword.
A Noxian ship once existed called Lightbringer's Bane. It stands to reason it was the bane of some other vessel or person, so this kinda makes sense to me being a Demacian bow.
WAY back it was said this thing was ancient Shuriman. God knows if that's still a thing but given the whole "Oasis of the Dawn", maybe it actually is?
That's all I've got at the moment. God what a list.