Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Catholic Diocese of London, Ontario was created out of the Diocese of Toronto, along with the Diocese of Hamilton, Ontario, by Pope Pius IX on February 21, 1856. Pierre-Adolphe Pinsoneault was named the first Bishop of London on May 18 of that year. In 1859, Bishop Pinsoneault moved the seat of the diocese to Sandwich, on the Detroit River; the diocese was transferred back to London in November 1869, under Bishop John Walsh. The present cathedral of the Diocese, St. Peter's, was built in a French Gothic Revival style from 1880 to 1885. It was raised to the status of a minor basilica by Pope John XXIII in December, 1961.

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