Question: Who stayed in the Charles Walker House and invented the Confederate flag?

Context paragraphs:
Nicola Marschall: Nicola Marschall (1829 – February 24, 1917) was a German-American artist who supported the Confederate cause during the American Civil War.  He designed the original Confederate flag, the Stars and Bars, as well as the official grey uniform of the Confederate army.

Van Dorn battle flag: The Van Dorn battle flag is a historical Confederate flag with a red field depicting a white crescent moon in the canton and thirteen white stars; and trimmed with gold cord.  In February, 1862, Confederate general Earl Van Dorn ordered that all units under his command use this flag as their regimental colors.  The 4th Missouri and 15th Arkansas Infantry Regiments carried this flag into battle, as well as some of Van Dorn's old units in the Army of Mississippi and East Louisiana.

Paddy Walker House: The Paddy Walker House (also known as the Walker House) is the town of Kincardine's oldest building and the oldest standing hotel in Bruce County, Ontario, Canada.

Walker Home for Missionary Children: Walker Home for Missionary Children is a historic boarding house complex for the care of the children of religious missionaries while they were away from home.  It is composed of eight buildings, located at 161-63, 165, 167 Grove Street, 136, 138, 144 Hancock Street in the Auburndale village of Newton, Massachusetts.  The oldest building, the Harding House, was built c. 1850 by the father of Eliza Walker, founder of the Walker Home.  The main building in the complex, Walker House, is a large institutional Colonial Revival structure designed by Coolidge & Carlson, architects known for their academic structures, and built after Eliza Walker's original house burned down in 1911.

Walker House (Warren, Virginia): Walker House, also known as the William Walker House, is a historic home located at Warren, Albemarle County, Virginia.  It was built between 1803 and 1805, and is a one-story, three-bay hipped-roof brick house on a high English basement.  It has a one-story, one-bay, shed-roofed brick addition built in 1978.  It was built by James Walker, a long time employee of Thomas Jefferson.

The Proper Way to Hang a Confederate Flag: The Proper Way to Hang a Confederate Flag is an art installation by John Sims.  The controversial installation consists of a Confederate flag hanging from a noose at a 13-foot gallows.  "The Proper way to Hang a Confederate Flag" was first shown in Schmucker Gallery at Gettysburg College in 2004 as a part of Sims' "Recoloration Proclamation: The Gettysburg Redress".  "Recoloration Proclamation" targets specific traditional symbols of southern heritage, which are inextricably linked to slavery and racism in America.  Included in the exhibition are recolored Confederate flags, a Confederate flag hanging from the gallows, a contemporary rewrite of the Gettysburg Address, contemporary recordings of the song "Dixie", and a documentary film.  A notable piece featured in the exhibition "Recoloration Proclamation: The Gettysburg Redress" is "ReVote," an installation featuring three voting booths used in Florida's disputed 2000 presidential election with re-colored Confederate flags hanging above, including black, red, and green for the Pan-African Flag of the African Liberation Movement.  Pink and lavender Confederate flags with feathers and sequins were also created for the exhibition signifying "drag flags".  John Sims received national media attention for his lynching of the Confederate flag.

William Porcher Miles: William Porcher Miles (July 4, 1822 – May 11, 1899) 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 being reincorporated by William Tappan Thompson into the second design of the national flag in 1862.

Cedar Grove Plantation: Cedar Grove Plantation, also known as the Charles Walker House, is a Greek Revival plantation house located near Faunsdale, Marengo County, Alabama.  It is notable in having been the residence of Nicola Marschall for a brief period while the Walker family owned the property.  The house was added to the National Register of Historic Places on 13 July 1993 as a part of the Plantation Houses of the Alabama Canebrake and Their Associated Outbuildings Multiple Property Submission.

Exchange Flags: Exchange Flags is a Grade II listed building in Liverpool, England.  It is laid out in a 'U' shape, with Walker House situated on the west side and Horton House on the east side.  Walker House (formally known as Derby House) was adapted during its construction to include a reinforced bunker that housed the Western Approaches Command Headquarters, the command centre for the campaign waged against the German submarine fleet during WW2.  The courtyard faces Liverpool Town Hall and contains the Nelson Monument.

Phillip Walker House: The Phillip Walker House (also known as the Philip Walker House or Deacon Walker House) is an historic American Colonial house on 432 Massasoit Avenue in East Providence, Rhode Island.  It is the oldest house in East Providence.

Supporting paragraphs: Cedar Grove Plantation Nicola Marschall
Answer: Nicola Marschall