The world's first "Mercy" Hospital is founded in Pittsburgh, United States, by a group of Sisters of Mercy from Ireland; the name will go on to grace over 30 major hospitals throughout the world.

UPMC Mercy is a main hospital facility of the University of Pittsburgh Medical Center (UPMC) and is located in the Uptown section of the city of Pittsburgh, Pennsylvania, adjacent to Duquesne University, and a few blocks from the PPG Paints Arena and downtown Pittsburgh. It is the first chartered hospital to have been founded in the city of Pittsburgh and it is also the first hospital in the world to have been established by the Sisters of Mercy. It is also the first teaching hospital in the region, accepting residents to teaching positions beginning in 1848, one year after opening its doors.

Pittsburgh is a city in Allegheny County, Pennsylvania, United States, and its county seat. The city is located in southwestern Pennsylvania at the confluence of the Allegheny River and Monongahela River, which combine to form the Ohio River. It is the second-most populous city in Pennsylvania with a population of 302,971 at the 2020 census, while the Pittsburgh metropolitan area at over 2.43 million residents is the largest metropolitan area in both the Ohio Valley and Appalachia, the second-largest in Pennsylvania, and 28th-largest in the U.S. The greater Pittsburgh–Weirton–Steubenville combined statistical area includes parts of Ohio and West Virginia.

The Sisters of Mercy is a religious institute for women in the Catholic Church. It was founded in 1831 in Dublin, Ireland, by Catherine McAuley. In 2019, the institute had about 6,200 sisters worldwide, organized into a number of independent congregations. Notable achievements include the foundation of education and health care facilities, around the world.

January 1 is the first day of the calendar year in the Gregorian Calendar; 364 days remain until the end of the year. This day is also known as New Year's Day since the day marks the beginning of the year.