1106 – Death of Henry IV of Germany.
The Holy Roman Emperor who walked to Canossa.
1086 – Murder of Cnut the Holy.
1103 – Death of Erik I of Denmark.
Son of Henry I of France and Anna of Kiev.
778 – Birth of Louis the Pious.
1117 – Murder of Saint Magnus.
Must-read article about lead pollution across Europe in the twelfth century. The research at Harvard is making interesting discoveries related to events known from medieval sources. I found it via Medievalists.net, but you can also read the article directly via Antiquity.