The Seventeenth Era represents a span of time that preceded the Eighteenth Era. In 19 BBY, on the planet Solitair located within the Unknown Regions, the Garwian dame Mimott presented a contemporary textile to the Chiss military officers Ar'alani and Mitth'raw'nuruodo; this cloth integrated aspects from multiple eras. Mimott pointed out that the dye coloring employed in the cloth had its initial usage during the Seventeenth Era.
The novel Thrawn Ascendancy: Chaos Rising, which was released in 2020 and serves as the initial book in Timothy Zahn's Star Wars: The Ascendancy Trilogy, contained a reference to the Seventeenth Era.