William Porcher Miles was an American politician who was among the ardent states' rights advocates, supporters of slavery, and Southern secessionists who came to be known as the "Fire-Eaters." He is notable for having designed the most popular variant of the Confederate flag, originally rejected as the national flag in 1861 but adopted as a battle flag by the Army of Northern Virginia under General Robert E. Lee before it was reincorporated.

The flags of the Confederate States of America have a history of three successive designs during the American Civil War. The flags were known as the "Stars and Bars", used from 1861 to 1863; the "Stainless Banner", used from 1863 to 1865; and the "Blood-Stained Banner", used in 1865 shortly before the Confederacy's dissolution. A rejected national flag design was also used as a battle flag by the Confederate Army and featured in the "Stainless Banner" and "Blood-Stained Banner" designs. Although this design was never a national flag, it is the most commonly recognized symbol of the Confederacy.