Year 1506 was a common year starting on Thursday (link will display the full calendar) of the Julian calendar. Events of 1506 January - June January 22 - The Swiss Guard arrives at the Vatican, to serve as permanent ceremonial and palace guards under Pope Julius II. April 18 - Pope Julius II lays the foundation stone of the new (current) St. Peter's Basilica, replacing the Old Saint Peter's Basilica. July - December August 19 - Sigismund I the Old succeeds his brother as King of Poland.… (More on 1506)