There are dozens and dozens of saints named Mary. You need to be specific.
St. Mary's Church of the Assumption was created in 1895.
St. Mary's Catholic Church in Newport, RI.
St. Mary's Church of Gilberts was created in 1882.
Church of St Mary of the Angels was created in 1970.
St. Mary of Victories Church was created in 1843.
St. Mary's of the Mountain Church was created in 1839.
St. Mary di Rosa is not a patron saint, but she is a saint in the Roman Catholic religion. So she is not the "saint of" something.
St. Mary's cathedral was originally built in 1821, but was unfortunately destroyed by a fire. So the new cathedral was built in 1868
here is no Saint Mary Alzheimer. This is a hospital named St. Mary's Alzheimers Center.
Church of St. Mary of the Spring - Istanbul - was created in 1835.
Collegiate Church of St Mary Youghal was created in 1220.
St. Mary Anne's Episcopal Church was created in 1742.