Lulworth skipper S. A. von Rottemburg in 1775. The butterfly was first discovered in Britain on 15 August 1832, when specimens were taken from Lulworth Cove in Dorset by English naturalist James Charles Dale It was introduced the following year as the Lulworth skipper ("Thymelicus acteon"), a name that has remained unchanged; it is the only one of Britain's vernacular butterfly names for which there has never been a proposed substitute. The male Lulworth skipper has a wingspan of , and the female 25 to 28 mm. This makes it one of Britain's smallest butterflies and, in Europe, the smallest member of
Lulworth Castle nearby. In the 1970s, restoration work began with the help of English Heritage. The restoration, finished in 1998, included a new roof and restored surviving walls in the interior, but no new internal walls or replacements for the destroyed upper floors were constructed. The castle is still owned by the Weld family and is a tourist attraction, holding medieval-themed events. Part of the Lulworth Estate is in use as an MoD firing range as well as a wildlife conservation area. Since 2017, the site has been used as the location for the Bestival music festival, with the castle's foreground being