Category:Categories by period (flat list)
See also: Category:Categories by style (flat list).  | This is a chronological category. Do not diffuse files from the main topic category into this category; instead, add them to this category while retaining them in the main topic category as well. |
 | This category should only contain other categories. Galleries should be in the corresponding categories instead. Files should be in a parent or subcategory. |
 | This flat category gathers all sub-categories with the criterion “by period” in its name (whether at the end or in the middle) in a non-hierarchical list. |
 | This category is hidden and appears after all non-hidden categories, but only if the appropriate user preference is set. |
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