Question: What is the population of the country of the Concordat treaty involving a King who was the son of Charles ?

text: Concordat
List
Further information : Treaties of the Holy See , Multilateral Treaties signed by the Holy See and Concordats with individual states of Germany There have been at least several hundred concordats over the centuries . [ 19 ] The following is a sortable list of the concordats and other bilateral agreements concluded by the Holy See .
A concordat is a convention between the Holy See and a sovereign state that defines the relationship between the Catholic Church and the state in matters that concern both, i.e. the recognition and privileges of the Catholic Church in a particular country and with secular matters that impact on church interests. According to P.W. Brown the use of the term concordat does not appear until the pontificate of Pope Martin V (1413-1431) in a work by Nicholas de Cusa, entitled De Concordantia Catholica. The first concordat dates from 1098, and from then to the beginning of the First World War the Holy See signed 74 concordats. Due to the substantial remapping of Europe that took place after the war, new concordats with legal successor states were necessary. The post-World War I era saw the greatest proliferation of concordats in history. Although for a time after the Second Vatican Council, which ended in 1965, the term 'concordat' was dropped, it reappeared with the Polish Concordat of 1993 and the Portuguese Concordat of 2004. A different model of relations between the Vatican and various states is still evolving in the wake of the Second Vatican Council's Declaration on Religious Liberty, Dignitatis humanae. [citation needed]
Treaty Contracting party Date of conclusion
1107 Concordat of London with Henry I of England 1 Aug 1107
1122 Concordat of Worms between Pope Calixtus II and Henry V of the Holy Roman Empire 23 Sep 1122
1210 Parliament of Ravennika between Pope Innocent III and the princes of Frankish Greece May 1210
1277 Concordat of Tonsberg between Jon Raude , Archbishop of Nidaros and Magnus VI of Norway 1277
1418 Concordats of Constance France , England , Germany , Spain , Italy
1426 Concordat between Pope Martin V and Charles VII of France 1426
Fürsten Konkordat between Pope Eugenius IV and the Princes Electors of the Holy Roman Empire Jan 1447
1516 Concordat of Bologna between Pope Leo X and King Francis I of France Sep 1516
1610 Concordat of Mi'kmaw between Pope Paul V and Grand Chief Henri Membertou of Grand Council of Mi'kmaw Nation 1610
1753 Concordat of Bologna between Pope Benedict XIV and King Ferdinand VI of Spain 1753
1801 Concordat between Pope Pius VII and Napoléon of France 15 July 1801
1813 Concordat of Fontainebleau between Pope Pius VII and Napoléon of France 25 Jan. 1813
1817 Concordat between the Holy See and Bavaria 5 Jun 1817
1817 Concordat between the Holy See and King Louis XVIII of France 11 Jun 1817
1827 Concordat between the Holy See and the Netherlands 16 Sep. 1827
1847 Concordat between the Holy See and Russia 3 Aug 1847
1851 Concordat between the Holy See and Spain 16 Mar 1851
1852 Concordat between the Holy See and Costa Rica 7 Oct 1852
1854 Concordat between the Holy See and Guatemala 1852
1855 Concordat between the Holy See and Austria 1855