The term 'christen, as a knight' can be summarized by the word 'DUB'. This is a term used in the Middle Ages to refer to the ceremony of conferring knighthood. During this ceremony, a knight-to-be would kneel before the monarch and receive a tap on the shoulder with a sword, symbolizing their acceptance into the order of knighthood. This ceremony was known as dubbing, and it is still used today in some countries.