James Sedgwick (1425 – 1478) was the 17th great-grandfather of Cometan and the earliest known paternal ancestor of the founder of Astronism. Born in Yorkshire in the early 15th century, James was the father of John Sedgwick (1455 – 1540) and is recorded as having died at the age of fifty-three. 

In Cometanic ancestry, James is categorised as part of the 19th generation retrograde, classifying her as a distant ancestor of Cometan.

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