1011: What Happened a Thousand Years Ago?

According to Wikipedia, the year 1011 was full of interesting events.  Here's just a few:

• Alhazen, an Iraqi scientist, feigns madness while a prisoner in Egypt as he works on his Book of Optics.
• The Chinese rime dictionary Guangyun is written.
• Ralph the Staller is born.
• The Danes capture Canterbury, including AElfheah, the Archbishop of Canterbury