Long-lost

"No hope have I my ancient fatherland, / or darling boys, or long-lost sire to see, / whom now perchance, the Danaans will demand, / poor souls! for vengeance, and their death decree, / to purge my crime, in daring to be free."

These are evidence of a long-lost, ancient culture.

He's my long-lost brother.

Egypt is celebrating the return of the long-lost mummy that has spent more than a century across the Atlantic.

My long-lost brother showed up, borrowed money and vanished again.