The city of Philadelphia was founded on this day, October 27, in 1682. This map of the City of Philadelphia, from The Franklin Institute's collection, was drafted just one year later by surveyor Thomas Holme. Image: "A Portraiture of the City of Philadelphia in the Province of Pennsylvania in America," by Thomas Holme, Surveyor General. Sold by Andrew Sowle in Shoreditch, London. 1683. | The Franklin Institute