Investigations were performed and Joan was declared innocent on July 7, 1456. After that, she was on her way to being canonized.
The first and often most difficult step is beatification. The promoters of the cause are asked to vouch for four authentic miracles in order to secure beatification. One miracle can be dispensed if the candidate has founded a religious order. In Joan’s case, the Pope granted dispensation because she had saved France. This seemed fair enough! So then, three approved miracles were necessary for Joan’s beatification. Three nuns, all living in France, received documented cures attributed to Joan of Arc’s intervention. These miracles were accepted as authentic.
Once a person is beatified (or declared blessed), the faithful are allowed to venerate these individuals. However, this is not universally recognized and usually limited to the towns connected to the person.
The next step, once beatification has been declared, is canonization. Two more miracles must be proven for canonization. Two such miracles were attributed to Joan of Arc which sealed her sainthood—a healing from tuberculosis and the healing of a hole in the sole of a woman’s foot.