There are several saints and blesseds named Laura so you need to be specific.
The patron saint of sports (athletics) is St. Sebastian, not St. Chloe.
There is no saint named Columbus.
There is no saint named Paricia.
St. Petersburg is the name of a city and not a saint.
St. Jude Thaddeus, also known as St. Jude, became a saint shortly after his death, around the 1st century AD. He is recognized as the patron saint of desperate cases and lost causes.
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There is a St. John the Baptist but no St. John Paul the Baptist.
Andrew is a saint but not a patron saint.
1921
There seems to be no Saint Cadog, however there is Saint Cadoc of Llancarvan. Is this who you were referring to?
Pius XI is not yet a canonized saint.
St. Sebastian was selected to become a saint because of his martyrdom. He was a Christian who was executed for his faith during the Roman emperor Diocletian's persecution of Christians. St. Sebastian's steadfast commitment to his Christian beliefs and his courage in the face of persecution led to his recognition as a saint by the Catholic Church.