What is Regensburg?
{{Infobox German location |type = City |image_photo = Rgbg-dom und rathaus.jpg |imagesize = |image_caption = |image_flag = Flagge Regensburg.svg |image_coa = Wappen Regensburg.svg |coordinates = {{coord|49|1|N|12|5|E|format=dms|display=inline,title}} |image_plan = |plantext = Panorama |state = Bavaria |district = [[Urban districts of Germany|Urban district]] |elevation = <!-- 326–471 --> |area = 80.76 |postal_code = 93001–93059 |area_code = 0941 |licence = R |Gemeindeschlüssel = 09 3 62 000 |divisions = 18 districts |website = [https://www.regensburg.de/ www.regensburg.de] |mayor = Gertrud Maltz-Schwarzfischer<ref>[https://www.statistik.bayern.de/wahlen/kommunalwahlen/bgm/ Liste der Oberbürgermeister in den kreisfreien Städten], accessed 19 July 2021.</ref> |leader_term = 2020&ndash;26 |Bürgermeistertitel = Oberbürgermeister |party = SPD |footnotes = {{Infobox UNESCO World Heritage Site |child = yes |Official_name = Old town of Regensburg with Stadtamhof |ID = 1155 |Year = 2006 |Criteria = Cultural: ii, iii, iv |Area = 182.8 ha |Buffer_zone = 775.6 ha }} }} {{Infobox Former Country |native_name = ''Reichsstadt Regensburg'' |conventional_long_name = Imperial City of Regensburg |common_name = Regensburg | |era = Middle Ages |status = City-state |empire = Holy Roman Empire |government_type = Republic | |year_start = 1245 |year_end = 1803 | |event_pre = First settled |date_pre = [[Stone Age]] |event_start = Gained ''[[Reichsfreiheit]]''¹ |date_start = <!--- Optional: Date of establishment, as [[1 January]], [[1801]]---> |event1 = City annexed by [[Duchy of Bavaria|Bavaria]] |date_event1 = [[1486]] – [[1496|96]] |event2 = City adopted [[Protestant Reformation|Reformation]] |date_event2 = [[1542]] |event3 = Made permanent seat <br />&nbsp;&nbsp;&nbsp;&nbsp;of the [[Reichstag (institution)|Reichstag]] |date_event3 = &nbsp;<br />[[1663]] – [[1806]] |event_end = [[German Mediatisation|Mediatised]] to new <br />&nbsp;&nbsp;&nbsp;&nbsp;[[Archbishopric of Regensburg|Archbishopric]]² |date_end = &