Graz-Karlau Prison serial killer Wolfgang Ott; and the terrorist Tawfik Ben Chaovali, who was involved in the Rome and Vienna airport attacks. Graz-Karlau Prison Graz-Karlau Prison () is located in Gries, the 5th district of the city of Graz, capital of the Austrian state of Styria. With a capacity of 552 inmates, Graz-Karlau is the third largest prison in Austria. Built between 1584 and 1590 in late Renaissance style to designs by Antonio Tade and Antonio Marmoro, it was used as a summer hunting residence for Archduke Karl II of Austria. Originally, it was called "Dobel Castle". The German word "Dobel" is
St. Leonhard, Graz St. Leonhard, Graz St. Leonhard is the 2nd district of the Austrian city of Graz. It is located in the east of the city along the Leonhardbach and stretches south to the St. Peter City Cemetery. It borders the district of Geidorf to the north, Ries and Waltendorf to the east, Jakomini to the south and Innere Stadt to the west. It had a population of 15,136 in 2011 and covers an area of 1.83 square kilometres. The postal codes of Ries are 8010 and 8016. Within the district are situated the catholic churches of St. Leonhard (first mentioned in