It's interesting how certain threads seem to continue down through the centuries. For example, I was recently reading a travel site about India, and the (presumably Hindu) author lamented the sacking of a particular temple in the 11th century by the Muslim invader, Mahmud of Ghazni.
Of course, there's nothing wrong with having a long cultural memory. In fact, as a historian, I am thankful that people choose to remember the past! On the other hand, 1,000 years is a long time to hold a grudge. But perhaps I only find it so because I'm European-American, and we don't have anywhere near that span of time to recall.