| Royal blue (traditional) |
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| Hex triplet | #002366 |
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| sRGBB (r, g, b) | (0, 35, 102) |
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| HSV (h, s, v) | (219°, 100%, 40%) |
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| CIELChuv (L, C, h) | (16, 44, 260°) |
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| Source | The Mother of All HTML Colo(u)r Charts |
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| ISCC–NBS descriptor | Deep blue |
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B: Normalized to [0–255] (byte)
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| Royal blue (web color) |
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| Hex triplet | #4169E1 |
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| sRGBB (r, g, b) | (65, 105, 225) |
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| HSV (h, s, v) | (225°, 71%, 88%) |
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| CIELChuv (L, C, h) | (48, 103, 260°) |
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| Source | X11 |
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| ISCC–NBS descriptor | Vivid blue |
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B: Normalized to [0–255] (byte)
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| Royal blue (Pantone) |
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| Hex triplet | #3D428B |
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| sRGBB (r, g, b) | (61, 66, 139) |
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| HSV (h, s, v) | (236°, 56%, 55%) |
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| CIELChuv (L, C, h) | (31, 58, 264°) |
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| Source | Pantone |
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| ISCC–NBS descriptor | Deep purplish blue |
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B: Normalized to [0–255] (byte)
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Royal blue is a deep and vivid shade of blue. It refers to a deep blue that, ever since 508 AD and the baptism of Clovis I, has been associated with the Kings of France, the French Monarchy, and France as a nation. It was the main color of the uniform of the French Royal Guards regiment, which were created in 1563 to ensure the King's Guard. Very soon, starting in the 17th century, it became the color of all the uniforms of the French Army, from the Musketeers, during the Napoleonic era, and all the way to World War I, until it was made obsolete as a color for battle uniforms by modern warfare and the need for camouflage.