Crompton was the second son of John Crompton of Prestall, Deane, Bolton, Lancashire[1] and subsequently of London,[2] and his wife Anne, daughter of Ralph Ashton of [Great Lever], Lancs.
[3] By 1580 Crompton was working as chirographer of the Court of Common Pleas, when he was granted permission to build a new Fines Office in the grounds of the Inner Temple.
[1] It was presumably to the Earl's influence that he owed his parliamentary seats for Steyning in 1589, Radnor in 1593 and for both Leominster and Beverley in 1597.
[1] His daughter Mary married William Gee, recorder of Beverley in 1597.
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