Tetsworth, Oxfordshire

Shirburn Castle, Tetsworth, was the seat of the Parker family, later Earls of Macclesfield. William Jones (1675-1749), originator of the modern usage of π, was tutor to the family here for some years, teaching both the first and second Earls. George Parker (1697-1764), the second Earl, became a noted astronomer. He was the co-author and co-promoter of the 1751 bill for adopting the Gregorian calendar and then PRS in 1752-1764. [DNB]

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An extract from The Mathematical Gazetteer of the British Isles created by David Singmaster

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