The Gatekeeper (Pyronia tithonus), also called the Hedge Brown, is a medium-sized orange-and-brown butterfly of the family Nymphalidae (subfamily Satyrinae), recognisable by the dark forewing spot enclosing two white pupils and, in males, a distinctive androconia patch (sex-brand) across the forewing. Adults are on the wing from July to August (occasionally from late June in warm or southerly conditions), favouring sheltered hedgerows, woodland edges, and scrubby field margins across Europe, with additional populations in Morocco and western Turkey. Larvae feed nocturnally on fine grasses including bents (Agrostis spp.), fescues (Festuca spp.), and meadow-grasses (Poa spp.). In gardens, adults nectar heavily on wild marjoram (Origanum vulgare), bramble, ragwort, and fleabane, making herb and wildflower plantings a reliable way to attract the species.

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Found across western, central, and southern Europe; absent from Scotland (bar occasional southern records), Scandinavia, and northern parts of the continent. Beyond Europe, the range extends to the Rif mountains of Morocco (North Africa), and to Turkey and the Caucasus in western Asia. Two subspecies are widely recognised — P. t. britanniae in the British Isles and P. t. tithonus across continental Europe — with P. t. distincta (Rothschild, 1933) described from Ketama, Morocco, whose status varies by authority.