Holy Lance
The name of the soldier who pierced Christ's side with a "lonchē" is not given in the Gospel of John, but in the oldest known references to the legend, the apocryphal Gospel of Nicodemus appended to late manuscripts of the 4th century "Acts of Pilate", the soldier is identified as a centurion and called Longinus (making the spear's Latin name "Lancea Longini").
Fisher King
The more recent writings have the lance presented in the Fisher King's castle with Christian theology. More specifically, it is supposed to be the lance that pierced Jesus Christ while on the cross. This is seen in Malory's "Le Morte d'Arthur". In Malory's version the Fisher King is healed with the blood from the lance, signifying it as a good, holy, Christian object. In "Corbenic" we see the precession at the Fisher King's feast, featuring heavily on the Holy Grail, which is a strong Christian artifact. It can be extrapolated that in the same precession, the accompanying lance is the lance that pierced Jesus Christ.