| Gideon Algernon Mantell 1790 - 1852 | ||
| 1790 | Born Gideon Algernon Mantell in Lewes, East Sussex, on 3rd February, the son of a shoemaker | |
| 1805 | Apprenticed to James Moore, surgeon in Lewes | ![]() |
| 1811 | Gained diploma for MRCS | |
| 1813 | Published in Sussex Advertiser Geology of the Environs of Lewes | |
| 1814 | First published geological paper | |
| 1816 | Married Mary Ann Woodhouse. Appointed military surgeon at the Royal Artillery Hospital, Ringmer, Lewes. Purchased practice of James Moore at Lewes for £95 | |
| 1818 | Purchased 2 houses at Castle Place, Lewes. Published A Sketch of the Geological Structure of the South-eastern part of Sussex. Birth of his first child, Ellen Maria, on 30th May | ![]() |
| 1820 | Birth of his second child, Walter, March 11th |
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| 1822 | Published The Fossils of the South Downs. Discovery of Iguanodon tooth by Mary Ann. Birth of third child, Hannah, on November 24th | |
| 1825 | Elected a Fellow of the Royal Society on 28th October | |
| 1827 | Published Illustrations of the Geology of Sussex: The Fossils of Tilgate Forest. Published Observations on the Medical Evidence necessary to prove the presence of Arsenic in the Human body. Birth of his fourth child, Reginald, August 11th |
Mantell's house in Lewes
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| 1831 | Published The Age of Reptiles | |
| 1833 | Published The Geology of South-East England. Moved to 20, The Steyne,Brighton. Opened his house as a Fossil Museum - the first in Britain. | |
| 1834 | Discovery of the Maidstone Iguanodon | |
| 1836 | Published Thoughts on a Pebble, dedicated to his youngest son Richard | |
| 1837 | His daughter Hannah falls ill in April | |
| 1838 | Very ill - much broken in health and spirits. Wrote to Natural History Museum, offering his entire collection for £5000. Agreed purchase for £4000. Moved to London and took over practice at Clapham Common | |
| 1840 | His daughter Hannah died in March, aged 18 | |
| 1841 | Involved in carriage accident. Afterwards he was always subjected to persistent pain. His whole attitude to life changed - he became morose and dispirited. Published On the Fossil Remains of Turtles, discovered in the Chalk Formation of the South-East of England | |
| 1844 | Left Clapham Common and moved to Pimlico | |
| 1845 | Began taking opium to alleviate his pain | |
| 1847 | Published Geological Excursion around the Isle of Wight | ![]() |
| 1850 | Published A Pictorial Atlas of Fossil Remains | |
| 1851 | Published Petrifications and their Teachings | |
| 1852 | swallowing 32 times the maximum dose... of opium! Lapsed into unconsciousness on 10th November, and died during the afternoon. Purchase of remainder of his collection by Natural History Museum - they had now received over 25000 of his specimens. Part of his diseased spine remains pickled on a shelf in the Royal College of Surgeons! | |
| 2000 | The Mantell Monument unveiled at Whiteman's Green, Cuckfield, in commemoration of Mantell's discovery in 1825. | |