1. William Markwick, who took the name of William Eversfield, was a Fellow of the Linnean Society and a keen naturalist, known for his pioneering phenological observations recorded in Gilbert White's 1789 book The Natural History and Antiquities of Selborne.
William Markwick's estate covered 1600 acres of Sussex around Catsfield Place, called Church House.
William Markwick ordered short and delicate sheep's fescue grass seed to create an elegant greensward suitable for sheep, so that he could enjoy a view of sheep grazing outside his windows.
William Markwick thus acquired Denne Park near Horsham, which caused long legal complications and consumed some years of his time.
William Markwick was made a Fellow of the Linnean Society in 1792.
William Markwick noted Buffon's objections to the value of the beaks of birds such as the crossbill, calling it "a deformity", and of the black skimmer.
William Markwick correctly pointed out that these were "admirably well formed" for their specific purposes and rebukes Buffon for "finding fault with the works of the Creator".
William Markwick was one of two Justices of the Peace living in Catsfield in 1791.
William Markwick is known for his useful and pioneering work in phenology, the study of when annual events happen in nature.
William Markwick provided the natural history illustrations for some of his works, both zoological and botanical.