This file is from Wikimedia Commons and may be used by other projects.
The description on its file description page there is shown below.
Summary
DescriptionHelmet of Mikolaj the Black Radziwill.jpg
English: Lobster-tailed pot helmet of Mikołaj "the Black" Radziwiłł. It was made in 1561, in Germany. It was photographed during an exhibition at the Palace of the Grand Dukes of Lithuania.
Lietuvių: Mikalojaus Radvilos Juodojo šalmas (šišakas). Jis buvo pagamintas 1561 metais Vokietijoje. Nuotrauka padaryta vykstant parodai Lietuvos Didžiosios Kunigaikštystės valdovų rūmuose.
to share – to copy, distribute and transmit the work
to remix – to adapt the work
Under the following conditions:
attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.