The closest order for Christof was the Hospitaller Knights of St-John, and even then, their uniform was different: White cross on a black surcoat.

Christof was not a member of the later Sovereign Military Order of Malta (former Knights of St. John), because the Order of Malta was a hospital order, therefore, destinations of Knights of St. John were not the warfare against any kind of "Barbarians", like in the game. In fact, their goal was to assist the elderly, the handicapped, refugees, children, the homeless, those with terminal illness and leprosy in five continents of the world, without distinction of race or religion.
Based upon the game I think that Christof was a noble Frenchman, but he was not a cavallier, so he could been a child of a poorest noble family, or he wasn't a first born son in a noble family (in the Middle Ages, first born son's got the most of heritage of their family, so a wealthy noble knight could be lots better armored than Christof). However, Christof's clothings weared by English knights - mostly in the Holy Lands -, and Christof's order had also an English leader (Sir Cuthbert)...
Additionally, there are some geographical errors in the game:
- Prague was never be the part of Hungary (see Sir Cuthbert's letter);
- Between Prague (Bohemia, now the capital of Czech Republic) and Bonn (in Germany) there is a very great distance;
- Between Prague and Vysehrad (Hungary) has an also too great distance.