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The large wall-painting behind the high altar was realized in 1905. In the upper part, the "Mystery of the Cross" depicts Christ shedding his blood, with, in the background, the towns of Bethlehem, where Christ was born, and Jerusalem where he died. The lower part depicts the transport of the relic from Jerusalem to Bruges: on the left, Thierry of Alsace receives the relic from Baldwin III of Jerusalem, King of Jerusalem ; on the right, kneeling besides Countess Sibylla of Anjou, he hands over the relic to the chaplain.