Just because a date is inscribed in stone does not mean it is necessarily more accurate than any other source containing a different date. Errors can still be made. Stonecutters may be working from handwritten notes that are difficult to read. The informant may have been misinformed. The stone may have been cut and erected decades after the person died. The inscription may be difficult to read. The purchaser of the tombstone is usually responsible for the information it contains. A tombstone is a source like any other.
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