Please be specific as there are a number of cathedrals named St. Patrick's.
Moscow
it was built so people can pray
Moscow, Russia.
In the late 5th century
it was dedicated to Saint Mary Nascent.
It was built in 1838. The Metropolitan Cathedral Church and Basilica of Saint Chad is the mother church of the Archdiocese of Birmingham and province of the Catholic Church in Great Britain
It was to honor IVAN THE TERRIBLE'S victory.
Russian architects, postnik,and barma
If you mean St Paul's Cathedral in London, it was designed by Sir Christopher Wren.
St. Mary's cathedral was originally built in 1821, but was unfortunately destroyed by a fire. So the new cathedral was built in 1868
Saint Patrick's Day is March 17.
Saint Chad is believed to have been buried in the St. Chad's Cathedral in Birmingham, England. His remains were originally interred in Lichfield Cathedral, but were later moved to Birmingham in the 19th century when the Cathedral was built there in his honor.