Philip Rashleigh III of Menabilly, Cornwall, was an antiquary and Fellow of the Royal Society and a Cornish squire. He collected and published the Trewhiddle Hoard of Anglo-Saxon treasure, which still gives its name to the "Trewhiddle style" of 9th century decoration.
He matriculated from New College, Oxford, 15 July 1749, and contributed to the poems of the university on the death of Frederick, Prince of Wales, a set of English verses, which is reprinted in Nichols's Select Collection of Poems ; he left Oxford without taking a degree. On the death of his father in 1764 he inherited the family seat of Menabilly, near Fowey on the south coast of Cornwall. He also took over from him in Parliament as the elected memberfor the family borough of Fowey on 21 January 1765, sitting continuously, in spite of contests and election petitions, until the dissolution of 1802, by which time he was known as the "Father of the House of Commons". His knowledge of Cornish mineralogy procured his election as a Fellow of the Society of Antiquaries and Fellow of the Royal Society in 1788.
Portrait
A portrait of Rashleigh, seated in a chair, was painted by John Opie about 1795, and is now in the Royal Cornwall Museum, Truro. It is a "fine specimen of the painter's best period".
Scientific work
Rashleigh's collection of minerals was remarkable for its various specimens of tin. It is held by the Royal Cornwall Museum, with portions at the Natural History Museum, and its most valuable portions are described in two volumes of Specimens of British Minerals from his cabinet. In the same collection are models in glass of the hailstones that fell on 20 October 1791, particulars of which, with the figured representations, are given, on Rashleigh's information, in King's Remarks on Stones fallen from the Clouds, pp. 18–20. He contributed antiquarian papers to the Archæologia, ix. 187–8, xi. 83–4, xii. 414, but they were derided by Dr. John Whitaker as the work of an "amateur in antiquarianism". A paper by him on certain "alluvial deposits" at Sandrycock, Cornwall, is in the Transactions of the Royal Geological Society of Cornwall, ii. 281–4, and a letter from him to E. M. Da Costa, on some English shells, is in the British Museum Addit. MS. 28541, f. 196. He constructed a remarkable grotto at Polridmouth, near the family seat.
