The README file accompanying the icons reads
This set represents a very very very long work... if you appreciate it, thank you to write me a small word on my guest book... it'll make me happy! ;)Below you will find each of Grégory Delattre's beautiful icons used on this web site.
The shield boss used for the Aegis icon is in the Metropolitan Museum of Art.
It is made of iron, decorated with engraved appliqués of gilt bronze.