In 2001 Märkischer Kreis entered a twinning arrangement with Racibórz (Ratibor), a county in Poland, which was formerly part of Silesia, Germany. In September 2002, a delegation from Racibórz visited Wrexham and began initial discussions about possible co-operation which led, eventually, to the signing of Articles of Twinning between Wrexham and Racibórz in March 2004. The Wrexham area has strong historical links with Poland. Following World War II, many service personnel from the Free Polish armed forces who had been injured received treatment at Penley Polish Hospital. Many of their descendants remain in the area to this day.