The present text is a translation into English of a slightly revised version of an article published in a peer-reviewed anthology, Michael v. Cotta-Schønberg, De Daniae regno aliqua non indigna cognitu : Danmarksbilledet hos en italiensk renæssancehumanist Æneas Silvius Piccolomini (Pius II). In : Renæssancen i svøb : dansk renæssance i europæisk belysning 1450-1550. Edited by Lars Bisgaard, Jacob Isager and Janus Møller Jensen. Odense, Syddansk Universitetsforlag, 2008, pp. 83-110. The two most important texts by Piccolomini on Danmark are discussed separately in another peer-reviewed anthology : Michael v. Cotta-Schønberg, To tekster af Æneas Silvius Piccolomini om Danmark. In : Umisteligt – Festskrift til Erland Kolding Nielsen. Red. af John T. Lauridsen og Olaf Olsen. Copenhagen, The Royal Library, 2007, pp. 55-74. It has been published in the h-prints repository in a slightly revised English edition as : Two Texts by Aeneas Silvius Piccolomini on Denmark