John Grimbaldeston (January 1, 1610 – 1673) was the 10th great-grandfather of Cometan, classified as one of Cometan’s distant maternal ancestors in the Prescott family line. Born in Kirkham, Lancashire, John was the son of William Grimbaldeston and the father of Dorothy Grimbaldeston. 

In Cometanic ancestry, John is classified as part of the 12th generation retrograde, thus categorising him as a distant ancestor of Cometan.

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