Year 1506 (MDVI) 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 suc… (More on 1506)