- In 500, western half of Roman Empire collapsed and Europe fragmented
- Many kings were relatively weak, power often rested with nobles
- Large amounts of Western Europe fell into economic decline
- Literacy largely became preserve of the Church
- Reasserted authority in mid-700s, stability largely returned by 1000
- In 11th and 12th century, created structure concentrated on pope
- Law of the church gave pope jurisdiction over church property
- Secular leaders demanded power to appoint bishops, pope disagreed
- Several social and economic events of 11th century contributed to crusades
- Reformers seeking to soften warlike habits popularized Truce of God
- Ambitious rulers were looking for new lands to conquer
- Italian merchants wanted trading posts in Muslim territory