The phrase "ago marked" is not correct and does not convey a clear meaning in written English.
It seems to be an incomplete or incorrect expression, and without additional context, it is difficult to determine its intended use.
Example: "The event was marked as significant five years ago."
Alternatives: "previously noted" or "designated in the past."
Sports aside, the city's resistance to school integration four decades ago marked it as a racially polarized place.
The fiery geysers that started shooting lava into the air three days ago marked Etna's first major eruption since 1992.
One and a half years ago marked the beginning of no meat, no dairy, and I have never felt better in my 73 years.
"Four days ago marked two decades since Ratko Mladic became the commander of the army of Republika Srpska – the VRS," prosecutor Dermot Groome said.
I don't shop much, but I did manage to buy an extraordinarily beautiful coverlet a few years ago, marked down to $100 from $500 — a triumph!
Ten years ago marked the introduction of a technique called CyTOF — a type of mass cytometry that measures up to 40 intracellular and surface protein markers from a single cell at once.
His birthday on 29 May 1265, 750 years ago, marks the beginning of a long literary journey towards the light.
That Saturday 40 years ago marks the most recent highwater mark of white nationalism and fascism in the UK.
His departure from the couture house he founded 40 years ago marks the end of a career that set a template for style that is still followed today.
The Ediacara biota (~575 541 million years ago) mark the emergence of large, complex organisms in the palaeontological record, preluding the radiation of modern animal phyla.
The Cambrian period, which began more than half a billion years ago, marks the moment when major groups of animals first appeared as fossils in rock strata.
