It was discovered in 1952 after a young boy named Stephen Christmas was found to be lacking this exact factor, leading to hemophilia.
A sample of his blood was sent to the Oxford Haemophilia Centre in Oxford, where Rosemary Biggs and R.G. McFarlane discovered that he was not deficient in Factor VIII, which is normally decreased in classic haemophilia, but a different protein, which received the name Christmas factor in his honour (and later Factor IX).
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