St. Peter's Basilica was constructed 1506-1626.
Saint John the Apostle is traditionally believed to have been buried in Ephesus, Turkey. His tomb is said to be located inside the Basilica of St. John, which was built over his grave in the 6th century.
St. Mark's Basilica was constructed in 1094, so now it should be 916 years old.
St. Peter's Basilica was constructed from 1506-1626.
The current basilica was constructed between the years 1506 and 1626. It is on the site of the earlier basilica which was in such poor state that it could not be renovated or salvaged.
Construction began on April 18, 1506 and was completed November 18, 1626.
The tomb of St. Mark is said to be in the Basilica of Saint Mark in Venice, Italy.
As Saint Patrick was a bishop in the 5th Century and the Protestant Reformation didn't occur until the 16th Century, it is safe to say that he was most definitely not a Protestant. He was a Catholic.
Saint Paul's basilica is located in Rome.
Old St. Peter's Basilica was the 4th-century church begun by the Emperor Constantine the Great between 319 and 333 AD.
St. Peter's Basilica was constructed between 1506 and 1626. Though further work was done to the edifice after that period. Even at that, however, the basic Basilica being constructed in 120 years qualifies as "breakneck speed" in the realm of Medieval cathedral building - 300 years was much more typical.
St. Patrick died in the 5th century so was still St. Patrick in 1840.