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Mary Sarginson (née Cowperthwaite; May 30, 1828 – May 13, 1892) was an English milliner and the 4th great-grandmother of Cometan, classified as one of Cometan’s distant paternal ancestors in the McKerney family line. Born in Killington, Westmorland, Mary married William Sarginson in October 1848 and they had at least one child together named Alice Sarginson. Mary is recorded as having died at the age of sixty-three in Warton, Lancaster. Her parents were George Cowperthwaite and Alice Osliff. Mary is understood to have been buried on 16th May 1892.
In Cometanic ancestry, Mary is categorised as part of the 6th generation retrograde, classifying her as a distant ancestor of Cometan.