Sylvester Moorcroft (April 1637 – July 1701) was the 10th great-grandfather of Cometan, classified as one of Cometan’s distant maternal ancestors in the Cottam family line.

Born in Ormskirk in Lancashire, Sylvester is recorded as having married Sidney Williams and as having raised at least one son, also named Silvester Moorcroft (1664 – 1742). Sylvester is recorded as having died at the age of sixty-four in Ormskirk. His father is recorded as having been William Moorcroft. 

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

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