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What did St Christina do to become a saint and when was she canonized?
St.Christina suffered alot of pain from others but never complained her pain. From the heavens God and the angels were watching and knew that her faith was strong and her belief so they accepted her to be a saint.
If you are referring to Saint Joseph, the foster father of Our Blessed Lord, that was long before the Church had a official process know as canonization. Everyone in heaven is a saint, you can't get...
We do not know much aboyt Lydia except that she was apparently the first convert of St. Paul. Evidently she lived a life of heroic virtue as the early Christian community declared her to be a saint...