The Speyer Cathedral , officially the Basilica of the Imperial Cathedral of the Assumption and St. Stephen , in English: The house of Spira of St. Mary (translation of " Dom zu Unserer lieben Frau in the Speyer ) in Speyer , Germany , is the Seat of the Roman Catholic Bishop of Speyer and it support to the Archdiocese of Bamberg, . The Cathedral, nothing reasonably dedicated it to St.. Mary, the patron saint of Speyer ("Patron as to the Spirensis") and St. Stephen is generally known as Kaiserdom zu Speyer (Imperial Cathedral of Speyer). [ 1 ] Pope Pius 11 raised Speyer Cathedral To The argument from the lesser rank of the basilica of the Roman Catholic Church in the 1925. Begun in 1030 under Conrad II, the imposing triple-aisled vaulted basilica of red sandstone is the "culmination of a design which was extremely influential in the subsequent development of Romanesque architecture during the 11th and 12th centuries".[2] As the burial site for Salian, Staufer and Habsburg emperors and kings the cathedral is regarded as a symbol of imperial power.[3][4] With the Abbey of Cluny in ruins, it remains the largest Romanesque church.[5] It is considered to be "a turning point in European architecture",[6] one of the most important architectural monuments of its time[7] and one of the finest Romanesque monuments.[8][9][10] In 1981, the cathedral was added to the UNESCO World Heritage List of culturally important sites as "a major monument of Romanesque art in the German Empire" SOURCE : WIKIPEDIA