1027 - Habsburg Castle Built
Count Radbot of Klettgau builds Habsburg castle near the village of the same name, then part of the Swabian county of Klettgau, now a municipality in the district of Brugg, in the Swiss canton of Aargau. His grandson Otto II takes the name von Habsburg from the castle, thus establishing what was to become one of the most powerful dynasties in European history. (Year is approximate - actual date is somewhere between 1020 - 1030).
Image Credit: By Roland Zumbühl (Picswiss), Arlesheim (Commons:Picswiss project) [GFDL (http://www.gnu.org/copyleft/fdl.html) or CC-BY-SA-3.0 (http://creativecommons.org/licenses/by-sa/3.0/)], via Wikimedia Commons