This delightful little butterfly is best-known for having two different looking forms, levana and prorsa that represent the spring and summer broods respectively.
The first 3 photos show the spring form levana; individuals are primarily orange in colour, giving them the appearance of a small fritillary.
The last 2 photos show the summer form prorsa; individuals are blackish with white markings and look more like a very small White Admiral (Limenitis camilla).

1st, 2nd & 3rd photo: Eifel National Park (near Camping Schafbachmühle), North-Rhine Westphalia, Germany, 5 May 2022
4th photo: Nature Reserve Urfttal, Schmetterlingspfad, North-Rhine Westphalia, Germany, 8 August 2022
5th photo: Perlenbach- und Furhtsbachtal, North-Rhine Westphalia, Germany, 7 August 2022