Bishop Michael Power originally built the Cathedral in 1845. He never saw its completion because he died of typhus, from the Irish who he helped when they more than doubled the size of Toronto:
"Bishop Power did not live to see the completion of the building he had spearheaded. In January 1847, Power had departed on a six month-month trip to Europe to recruit priests for the growing Diocese of Toronto and to raise money for the Cathedral. The trip took him to Ireland where he witnessed the Great Famine (1845-1851) that would result in the emigration of so many Irish to Canada. Prior to his return, Bishop Power sent a pastoral letter read in all Catholic churches in and around Toronto, urging congregations to be prepared for the influx of Irish Famine victims. Between May and October 1847 over 38,000 emigrants arrived in Toronto. With a population of only 20,000, the influx strained local resources. Upon his return to Toronto, Bishop Power administered to the sick and dying, many of who were suffering from typhus. He contracted the fever and died on October 1, 1847. During Bishop Power’s Episcopate, the number of Catholics in the Diocese of Toronto approximately doubled from 25,000 in 1842 to 50,000 to 1847. During his short term, Bishop Power provided energetic leadership to the Catholic community.
He is remembered for his contributions to the new Diocese of Toronto including the establishment of its operational framework. The construction of St. Michael’s Cathedral and his compassion to the victims of Irish famine. Although the funeral of Bishop Power was held at St. Paul’s, he was buried in the crypt of the unfinished St. Michael’s Cathedral."
I'm glad St. Michael he Archangel is out there protecting us all from evil. Of which there is a lot.