The Scutum constellation was based on a more modern figure than most constellations, being named for King Jan III Sobiesk (where the Saint gets his name), after his successful battles. Scutum is Latin for Shield, though the naming of Tateza is an odd choice for the movie.
While not appearing in the manga and anime, the Tateza Silver Cloth appeared in the first Saint Seiya movie, Evil Goddess Eris. Jan was a revived Saint (aka a Ghost Saint), and was given this version of the Cloth. In the end, it was damaged and left behind, the ghost having been beaten.