 | This is a non-diffusing subcategory of Category:20th-century monarchs. It includes 20th-century monarchs that can also be found in the parent category, or in diffusing subcategories of the parent. |
| This is a non-diffusing subcategory of Category:20th-century monarchs. It includes 20th-century monarchs that can also be found in the parent category, or in diffusing subcategories of the parent. |