Margaret "Peggy" Mackall Taylor was the first lady of the United States from 1849 to 1850 as the wife of President Zachary Taylor. She married Zachary in 1810 and lived as an army wife, accompanying her husband to his postings in the American frontier. She had six children, two of whom died in childhood while the remaining four were sent to boarding schools in the eastern United States. After a brief period of stable domestic life in the 1840s, her husband was elected President of the United States to her dismay in 1848. She managed the White House from the upstairs residence while she delegated her responsibilities as White House hostess to her daughter. She was highly reclusive throughout her tenure as first lady, which ended abruptly with her husband's death in 1850. She lived in obscurity until her death two years later.

Zachary Taylor was an American military leader who served as the 12th president of the United States from 1849 until his death in 1850. Taylor was a career officer in the United States Army, rising to the rank of major general and becoming a national hero for his victories in the Mexican–American War. As a result, he won election to the White House despite his vague political beliefs. His top priority as president was to preserve the Union. He died 16 months into his term from a stomach disease.