Often it’s a combination of radiocarbon dating and historical records. Though probably not in this instance, there are sometimes records found in other places t

Often it’s a combination of radiocarbon dating and historical records. Though probably not in this instance, there are sometimes records found in other places that say this or that person lived at the same time as another, so that can help to date things like this. Radiocarbon dating is highly accurate and 4400 years isn’t that long ago, so it’s generally accurate at dating organic remains to within a few decades. It gets less accurate over longer periods of time, but 4400 years is well within that window.